Brand | Thermaltake |
---|---|
Item model number | KB‐TPX‐SSBRUS‐01 |
Hardware Platform | PC |
Item Weight | 3.52 pounds |
Product Dimensions | 18.31 x 6.71 x 1.59 inches |
Item Dimensions LxWxH | 18.31 x 6.71 x 1.59 inches |
Color | BLACK |
Power Source | Corded Electric |
Manufacturer | Thermaltake USA Direct |
ASIN | B079NWN3NS |
Is Discontinued By Manufacturer | No |
Date First Available | February 5, 2018 |
Add to your order
- Coverage for accidental damage including drops, spills, and broken parts, as well as breakdowns (plans vary)
- 24/7 support when you need it.
- Quick, easy, and frustration-free claims.
- No Additional Cost: You pay nothing for repairs – parts, labor, and shipping included.
- Coverage: Plan starts on the date of purchase. Malfunctions covered after the manufacturer's warranty. Power surges covered from day one. Real experts are available 24/7 to help with set-up, connectivity issues, troubleshooting and much more.
- Easy Claims Process: File a claim anytime online or by phone. Most claims approved within minutes. We will send you an e-gift card for the purchase price of your covered product. In some instances, we will replace or repair it.
- Product Eligibility: Plan must be purchased with a product or within 30 days of the product purchase. Pre-existing conditions are not covered.
- Terms & Details: More information about this protection plan is available within the “Product guides and documents” section. Simply click “User Guide” for more info. Terms & Conditions will be available in Your Orders on Amazon. Asurion will also email your plan confirmation with Terms & Conditions to the address associated with your Amazon account within 24 hours of purchase.
- No Additional Cost: You pay nothing for repairs – parts, labor, and shipping included.
- Coverage: Plan starts on the date of purchase. Malfunctions covered after the manufacturer's warranty. Power surges covered from day one. Real experts are available 24/7 to help with set-up, connectivity issues, troubleshooting and much more.
- Easy Claims Process: File a claim anytime online or by phone. Most claims approved within minutes. We will send you an e-gift card for the purchase price of your covered product. In some instances, we will replace or repair it.
- Product Eligibility: Plan must be purchased with a product or within 30 days of the product purchase. Pre-existing conditions are not covered.
- Terms & Details: More information about this protection plan is available within the “Product guides and documents” section. Simply click “User Guide” for more info. Terms & Conditions will be available in Your Orders on Amazon. Asurion will also email your plan confirmation with Terms & Conditions to the address associated with your Amazon account within 24 hours of purchase.
- Buy a lot of stuff on Amazon? Tons of items eligible for coverage, from the latest tech like Laptops, Game Consoles, TVs, Phones, and Cameras to major appliances, sporting goods, tools, toys, personal care, furniture, and more (not eligible for commercial or business use items).
- Accidents Happen. That’s why for your portable products we cover accidental damage from handling such as drops, spills and cracked screens. We also cover electrical and mechanical malfunctions, power surges, and wear and tear.
- Past and Future Purchases covered. 30 days after you are enrolled, all eligible past purchases (up to 1 year prior to enrollment) and future eligible purchases made on Amazon will be covered by your plan as long as you are enrolled.
- Fast, easy claims. Frustration-Free claims, with most filed in minutes. We will fix it, replace it, or reimburse you with an Amazon e-gift card for the purchase price of your product (excluding tax). File at Asurion.com/amazon.
- No Hidden Fees. For just $16.99 a month + tax you’re covered for up to 5,000 in claims per 12-month period. *THIS PROGRAM IS MONTH-TO-MONTH AND WILL CONTINUE UNTIL CANCELED* Coverage for all products ends 30 days after the plan is canceled. Cancel any time.
Add to your order
- Coverage for accidental damage including drops, spills, and broken parts, as well as breakdowns (plans vary)
- 24/7 support when you need it.
- Quick, easy, and frustration-free claims.
Buy new:
$139.99$139.99
$4.99 delivery Thursday, April 10
Ships from: Super Component Store Sold by: Super Component Store
Save with Used - Like New
$119.98$119.98
FREE delivery Wednesday, April 9
Ships from: R3NEW Sold by: R3NEW
-
-
-
-
-
-
-
VIDEO
-

Image Unavailable
Color:
-
-
-
- To view this video download Flash Player
Thermaltake Tt Premium X1 RGB Smartphone Enabled Voice-Controlled AI 16.8 Million Color with 12 Lighting Effects Cherry MX Silver Switches Mechanical Gaming Keyboard KB‐TPX‐SSBRUS‐01 , Black
Learn more
Purchase options and add-ons
Brand | Thermaltake |
Compatible Devices | Gaming Console |
Connectivity Technology | USB |
Keyboard Description | Gaming |
Special Feature | Lighting |
Color | BLACK |
Number of Keys | 12 |
Keyboard backlighting color support | RGB |
Style | Cherry Silver |
Material | Plastic |
About this item
- Genuine Cherry MX Speed Silver Switches with 50 million keystrokes lifespan, features linear and quiet clicks with lowest actuation point
- Full range per key RGB illumination with 11 lighting effects, Tt RGB Sync capability with compatible Thermaltake RGB products for a better color coordination
- All peripheral features fully programmable via newly designed X1 GUI
- Audio & USB pass‐through port integrated for additional power and data options
- Detachable magnetic wrist rest included
Buy it with

Similar items that may deliver to you quickly
Top Brand: Thermaltake
What's in the box
Looking for specific info?
From the manufacturer

Cherry MX Silver Speed Switch
Designed for speed, the Cherry MX Silver speed switch provides smooth linear actuation with both lower actuation point (1.2mm) and total distance travelled (3.4mm) resulting in lighting fast response with each key press. The switches also come rated with a 50-million keystroke lifespan for utmost durability.
16.8M True RGB Illumination with 12 Lighting Effects
Stunning 16.8 million RGB color illumination under keys and choose between 12 different lighting effect settings coupled with 5 individual levels of brightness and lighting speed to provide maximum color customization.
12 Effects: Static, Pulse, Rainbow Wave, Spiral Rainbow, Spectrum Cycling, Reactive, Flow, Ripple, Raindrops, Snake Marquee, Sound Control, System Temp, Off.
TT Premium X1 RGB Software
Customize with the TT Premium X1 RGB gaming software and take control of the most expansive set of macros and personalization options. Give yourself full control to program multiple keystrokes to a single key, change backlighting effects with intuitive keyboard commands or set with easy to quick launch custom game profiles.
TT X1 RGB Sync Compatible
Compatible of syncing with Power Supply and Liquid Cooling Solutions - iRGB PSU, Riing Plus, Pacific W4 Plus CPU Water Block, Pacific RL360 Plus RGB Radiator, Floe Riing RGB 360, Pacific Lumi Plus LED Strip - for maximum color coordination and personalization. (TT X1 RGB Sync compatible product lines will automatically sync with the X1 RGB gaming software and does not require manual setup).
Smartphone Enabled Voice-Controlled AI
Featuring a specially designed voice controlled AI, users gain access to all light functions (color, effects, speed, and brightness) with easy-to-use voice recognition commands for a truly hands free gaming experience, without interruption.
Load Keyboard Macro Settings in Real Time
The App comes with a four key macro function which allows users to load up registered key commands from the gaming software and to execute a chain of commands in-game without interruption.
Game to Your Genre
Comes with pre-configured game genre lighting zone illuminations: FPS1, FPS2, MMO, MOBA, RTS for that all- important gaming advantage during gameplay. Furthermore, gamers can also customize their own unique custom lighting zones to effortlessly enhance their gaming experience in a way that is truly unique for them.
Patented (VGC) Virtual Game Controller
The App also features an exclusive patented (VGC) virtual game controller mode on your mobile device in order to play your favorite games over a wireless connection via your system and customized X1 controlled setup.
Red Keycap & Keycap Puller Included
Add extra flare to the X1 RGB with the 8 additional provided red keycaps (Q, W, E, R, A, S, D, F) and keycap puller for maximum customization.
Dedicated Volume/Mute & Multimedia Controls
Control sound levels on-the-fly and access multimedia controls with ease using the conveniently placed dedicated controls. Additional controls include Game Mode Activation, 5 Level Brightness Adjustment, and Windows Lock.
Audio & USB Pass Through
Connect your compatible 3.5mm 4-pole audio and USB 2.0 device via the conveniently placed pass-through for easy insertion and removal, without having to reach behind your computer.
Magnetic Wrist Rest Included
Included ergonomic magnetic wrist rest easily snaps into place at the front of the keyboard to ensure comfort is maximized, no matter how long you game.
![]()
Riing PLUS 12/14 RGB Fan
|
![]()
iRGB PLUS Power Supply
|
![]()
Floe Riing RGB AIO CPU Cooler
|
![]()
Pacific Lumi PLUS LED Strip
|
![]()
Pacific W4 PLUS Water Block
|
![]()
Pacific PR22-D5 PLUS Pump/Reservoir Combo
|
|
---|---|---|---|---|---|---|
Customer Reviews |
4.2 out of 5 stars 1,179
|
4.4 out of 5 stars 442
|
4.4 out of 5 stars 1,648
|
4.0 out of 5 stars 71
|
4.4 out of 5 stars 43
|
4.2 out of 5 stars 628
|
Price | $69.90$69.90 | — no data | — no data | — no data | — no data | $189.99$189.99 |
16.8 Million Colors with Rainbow Effect | Yes | Yes | Yes | Yes | Yes | Yes |
LED Number | 12 | 12 | 12 | 12 each Strip | 12 | 12 |
Light Mode | 11 | 7 | 11 | 11 | 11 | 11 |
Color Mode (RGB, Single Color, Off) | Yes | Yes | Yes | Yes | Yes | Yes |
Light Speed (Slow, Normal, Fast, Extreme) | Yes | Yes | Yes | Yes | Yes | Yes |
Controlled Software | Riing Plus RGB Software | DPS G PC App / DPS G Mobile App | Riing Plus RGB Software | Riing Plus RGB Software | Riing Plus RGB Software | Riing Plus RGB Software |
Sync with ASUS, GIGABYTE, MSI Motherboard with TT Sync Controller (CL-O015-PL00BL-A) | Yes | No | Yes | Yes | Yes | Yes |
Product Description
Featuring genuine Cherry MX switches, the Tt Premium X1 RGB Mechanical Gaming Keyboard comes in a sleek and stunning finish that delivers 16.8 million true RGB color illumination with 12 dynamic lighting effects for a truly enhanced gaming atmosphere. X1 also features: 4 pre‐configured FPS, RTS, MMO, MOBA lighting zones, full anti‐ghosting, n‐key rollover, on‐the‐fly macro recording, audio and USB pass through, it offers maximum customization to suit all your gaming needs. Included, is a detachable magnetic wrist rest for maximum ergonomic comfort during periods of long play and best yet, the X1 RGB is fully TT RGB Sync compatible, meaning that you'll be able to sync all your RGB colors seamlessly to all Thermaltake compatible product lines for even greater color coordination. "The TT Premium X1 RGB keyboard is sleek looking, it is solid, it is comfortable to use, the level of customization is superb, and on top of all of that, there is voice control too!" - TweakTown Editor's Chice Award
The X1 RGB gaming keyboard comes in a sleek and stunning finish that delivers 16.8 million of true RGB color illumination with 12 dynamic lighting effects. Best yet, it is exclusively compatible with all Thermaltake TT RGB Sync Power Supply and Liquid Cooling Solutions – iRGB PSU, Riing Plus, Pacific W4 Plus CPU Water Block, Pacific RL360 Plus RGB Radiator, Floe Riing RGB 360, Pacific Lumi Plus LED Strip – and any other product range sporting the TT RGB Sync logo, enabling enthusiasts to sync all RGB colors seamlessly to all Thermaltake compatible product lines for even greater color coordination. In addition, the X1 RGB comes with an exclusively designed smartphone/tablet app with voice controlled AI for access to light functions and essential macros. The app also includes an exclusive patented designed Virtual Game Controller (VGC) mode for a truly unique and astounding mobile gaming experience.
Color: BLACK
OF MACRO KEYS: NO
OF GAME PROFILES: SIX
GRAPHICAL UI: YES
Weight : 1598 GRAMS
GOLD-PLATED USB: YES
Dimension: 464.98 x 170.52 x 40.39 mm
Interface: USB
ANTI-GHOSTING KEYS: YES / N KEY Rollover (USB)
ON-BOARD MEMORY SIZE: 4M bit
POLLING RATE: 1000 HZ
BACK-LIGHT: 16.8 Million RGB Colors
WRIST REST: YES / Detachable
AUDIO AND USB PASS-THROUGH: YES
MULTIMEDIA KEYS: 6
BRAIDED CABLE: YES
Cable Length: 1.8 M
SWITCH TYPE: Mechanical
SWITCH NAME: CHERRY MX SPEED RGB SILVER MECHANICAL
ACTUATION POINT: SPEED RGB SILVER : 1.2 ± 0.4 MM
KEY STROKE: SPEED RGB SILVER : 3.4 - 0.4 MM
ACTUATION FORCE: 45g(SILVER) with Optimized Tactile Feel
KEY LIFESPAN: 50 Million Clicks Lifetime
Product information
Technical Details
Additional Information
Customer Reviews |
4.2 out of 5 stars |
---|---|
Best Sellers Rank | #149,013 in Video Games (See Top 100 in Video Games) #11,311 in PC Gaming Keyboards |
Warranty & Support
Feedback

Thermaltake Tt Premium X1 RGB Smartphone Enabled Voice-Controlled AI 16.8 Million Color with 12 Lighting Effects Cherry MX Silver Switches Mechanical Gaming Keyboard KB‐TPX‐SSBRUS‐01 , Black
Share:
Found a lower price? Let us know. Although we can't match every price reported, we'll use your feedback to ensure that our prices remain competitive.
Where did you see a lower price?
Fields with an asterisk * are required
Discover similar items
Price
Color
Operating System
Brand
Recommended Use
Item Length Longer Edge
Style
Included Components
Item Height Surface To Top
Hand Orientation
Number of Keys
Premium Electronics
Special Features
Item Width Shorter Edge
Keyboard Backlighting Color Support
Number of Batteries
Connectivity Technology
Top Brands in Electronics
Theme
Customer reviews
Customer Reviews, including Product Star Ratings help customers to learn more about the product and decide whether it is the right product for them.
To calculate the overall star rating and percentage breakdown by star, we don’t use a simple average. Instead, our system considers things like how recent a review is and if the reviewer bought the item on Amazon. It also analyzed reviews to verify trustworthiness.
Learn more how customers reviews work on AmazonTop reviews from the United States
There was a problem filtering reviews. Please reload the page.
- Reviewed in the United States on November 4, 2020Style: Cherry SilverVerified PurchaseThe keys are very light and respond very quickly, it feels like your hands are hovering over the keybooard and the keyboard is typing for you, the design is overall great as well, don't download the software, i heard it might mess up the keyboard, but overall, the keyboard is already worth the $$$, if you want a keyboard thats more on the software stuff, i recommend razar, but overall, 10/10 keyboard
- Reviewed in the United States on May 1, 2019Style: Cherry SilverVerified PurchaseIn Japan, only Japanese sequences are sold, and US sequences are desired and purchased at amazon.com.
It is the first Cherry MX Speed, but it is light and easy to hit.
Well, it's too light and there is a mistake, but it's not good.
It is good that volume control can also be done with a roll key!
RGB also has various modes, and linkage with Thermaltake products is great if you use software.
- Reviewed in the United States on May 3, 2018Style: Cherry SilverVerified PurchaseQuick and dirty:
Pro's:
Great feedback from the keys/ switches
Lots of functions
The software has lots of features, however...(see con's below)
RGB!!!(see con's below, cuts both ways due to the software)
Con's:
Software is, bloated. 200mb+ process when running. Dude, seriously?
Can't take full advantage of the RGB functionality because you have to run the software to see the color scheme you created
The firmware updater crashes. This is the dangerous because that can or will brick the keyboard in which you'll have to submit an RMA or just ask for a refund!
One of the keys(the + key on the numpad) was detached when I received the package, and for some reason doesn't sit entirely flush on the switch
I didn't get a wrist rest in my package...while I don't use them all the same I did pay for a complete package
Takeaway:
It's a good keyboard but Thermaltake needs to get their QA game straight RE packaging, also, FIX THE FIRMWARE UPDATER, and, GREATLY minimize the resource usage for the software...
The phone app while good in theory seriously lacks in practice
- Reviewed in the United States on April 21, 2018Style: Cherry BlueVerified PurchaseEdit 6/1/18
New software version is incompatible with old profiles, meaning you must recreate each profile you previously made. New firmware makes the keyboard become unresponsive after exactly 2.8 days of power on time. If you never turn off or hibernate your system, it will simply stop responding requiring a system reboot. If you simply unplug and reconnect the USB connections every key works but for the Windows key, the control, alt, F1-F12 keys and the escape key. I am past the return window and do not expect anything from Thermaltake.
Pros: Keyboard design is excellent, with a conventional layout and working media keys and surprisingly good mechanical feedback.
Cons: The documentation barely qualifies as printed material, and the software is even worse.
The software cannot be done any worse than it is right now. Profiles can be created, then they must be exported, then re-imported into the software. In my experience, this limits you to 4 as the pulldown where you can select a profile seemingly doesn't allow for more. This does not replace the profiles on the keyboard though, so to keep your key assignments, macros and lighting profiles as created the X1 software must be running at ALL TIMES. Which is kind of big deal when it crashes after 2 hours or so.
Also, good luck navigating the cluster of Thermaltake's websites to get any documentation or software.
- Reviewed in the United States on April 26, 2018Style: Cherry SilverVerified PurchaseOne of the best keyboard for this price, You Can choose corsair or Razer and ignore this Little diamond but if You like the plastic frame (like all the Razer keyboard) You would love It. Not useble the app because Only for iOS for now and the software sometimes crash randomly, i Hope the future update could fix this.
- Reviewed in the United States on May 18, 2018Style: Cherry BlueVerified Purchasedoes not work properly with windows 10. lighting works fine. volume, mute buttons and macro/mapping does not work at all. windows 10 does not allow you to update the drivers from the standard HID keyboard drivers. you can download the thermaltake software all you want. but the thermaltake software doesn't recognize the keyboard. after installing their software you are met with a message prompting you to plug in a thermaltake device to get started. which as you might imagine is someone unhelpful seeing as it is already plugged in...
- Reviewed in the United States on September 26, 2019Style: Cherry BlueVerified PurchaseLove the blue switches not to clickie compared to my old keyboard. I use this keyboard for gaming and live streaming it has really good build quality.
- Reviewed in the United States on June 25, 2019Style: Cherry BlueVerified Purchasewould just reccomend a corsair keyboard instead better quality and easier to use with icue
Top reviews from other countries
- BenReviewed in Canada on January 12, 2019
3.0 out of 5 stars Great keyboard, but... (TT X1 RGB Cherry Silver)
Style: Cherry SilverVerified PurchaseUpdate March 5 2023:
Once again, software updates have messed up the keyboard, but this time has got to be the strangest one yet. I have been using this keyboard problem free for 4 years, since last update. Now it does not sync with TT RGB Plus (Fans and mouse are syncing fine) and X1 RGB, the keyboard software, does not recognize the keyboard is inserted anymore! The mouse and speakers are plugged into the keyboard and volume control works fine, so I'm not sure why TT own software doesn't recognize the keyboard, again.
(Previous rating 4 stars, now down to 3 stars)
Update November 23 2019:
New software update addresses the issue with X1 syncing with the TT RGB Plus software. The software recognizes the keyboard without opening the X1 RGB software and can now be controlled all in one app again. Also the PARTY/MOVIE/GAME modes (RGB reacts to sound) settings are working again with the keyboard. (Previous rating 3 stars, now up to 4 stars)
Update March 15 2019:
The keyboard now fails to synchronize with the TT RGB+ software. Both TT RGB+ and TT X1 RGB keyboard software were up to date (see picture). RMA set up with TT was a great experience (fast response and turnaround time), but the replacement keyboard did not fix the issue of it not syncing up with the keyboard. Now I have a Mouse, AiO cooler, fans out of sync with the keyboard. No problem for single colour LED style, but forget about using the RGB settings. I dunno why the software is not recognizing the keyboard anymore, and I hope they push an update, otherwise avoid this keyboard if RGB sync is important to you. The keyboard is still functional, but it sucks paying so much and having some of the features not working as intended. (Previous rating 4 stars, now down to 3 stars)
The software program continuously crashed for me when I was typing a document, while playing music and using TT RGB PLUS software to sync it to the music. Usually happens in 12 mins in itunes, but an hour in youtube for some reason. Doesn't crash in gaming sessions, or if I use any other lighting selection.
1st time using silver keys (upgrading from membrane) and it surprised me how easy it is to press a key. It also very nice and clicky compared to the membrane keyboard I was using. I drag my fingers after every press, so it is very easy for me to hit another key while typing. The built in media keys are nice, especially the dedicated mute button. (My old keyboard had me hold the dedicated volume down button to mute)
This keyboard doesn't come with a wrist rest. The reviews I saw on YouTube keep mentioning one, but that could be the blue switches? Not too sure. Otherwise , the board is nice semi-gloss black look to it. Has a nice weight to it and the RGB colours are bright (which can be adjusted with keyboard button or software)
The software was easy enough to program keys, macros and lighting. But, the box says they had presets for FPS and MOBA (so the keyboard would highlight key buttons) but I can't find it anywhere in the software. The software updated the firmware pretty easy, compared to the ThermalTake Iris mouse. The Iris can't update the driver on the mouse for some reason, but at least the keyboard program is working. Also, this keyboard should be able to sync with Razer Chroma, but so far it doesn't work either and you'll have to continue using TT RGB Plus or TT X1 RGB software to control lighting.
Overall, hardware is great, but the software from ThermalTake is passable at best, but a buggy mess if you get a ThermalTake product that doesn't wanna update properly.
BenGreat keyboard, but... (TT X1 RGB Cherry Silver)
Reviewed in Canada on January 12, 2019
Once again, software updates have messed up the keyboard, but this time has got to be the strangest one yet. I have been using this keyboard problem free for 4 years, since last update. Now it does not sync with TT RGB Plus (Fans and mouse are syncing fine) and X1 RGB, the keyboard software, does not recognize the keyboard is inserted anymore! The mouse and speakers are plugged into the keyboard and volume control works fine, so I'm not sure why TT own software doesn't recognize the keyboard, again.
(Previous rating 4 stars, now down to 3 stars)
Update November 23 2019:
New software update addresses the issue with X1 syncing with the TT RGB Plus software. The software recognizes the keyboard without opening the X1 RGB software and can now be controlled all in one app again. Also the PARTY/MOVIE/GAME modes (RGB reacts to sound) settings are working again with the keyboard. (Previous rating 3 stars, now up to 4 stars)
Update March 15 2019:
The keyboard now fails to synchronize with the TT RGB+ software. Both TT RGB+ and TT X1 RGB keyboard software were up to date (see picture). RMA set up with TT was a great experience (fast response and turnaround time), but the replacement keyboard did not fix the issue of it not syncing up with the keyboard. Now I have a Mouse, AiO cooler, fans out of sync with the keyboard. No problem for single colour LED style, but forget about using the RGB settings. I dunno why the software is not recognizing the keyboard anymore, and I hope they push an update, otherwise avoid this keyboard if RGB sync is important to you. The keyboard is still functional, but it sucks paying so much and having some of the features not working as intended. (Previous rating 4 stars, now down to 3 stars)
The software program continuously crashed for me when I was typing a document, while playing music and using TT RGB PLUS software to sync it to the music. Usually happens in 12 mins in itunes, but an hour in youtube for some reason. Doesn't crash in gaming sessions, or if I use any other lighting selection.
1st time using silver keys (upgrading from membrane) and it surprised me how easy it is to press a key. It also very nice and clicky compared to the membrane keyboard I was using. I drag my fingers after every press, so it is very easy for me to hit another key while typing. The built in media keys are nice, especially the dedicated mute button. (My old keyboard had me hold the dedicated volume down button to mute)
This keyboard doesn't come with a wrist rest. The reviews I saw on YouTube keep mentioning one, but that could be the blue switches? Not too sure. Otherwise , the board is nice semi-gloss black look to it. Has a nice weight to it and the RGB colours are bright (which can be adjusted with keyboard button or software)
The software was easy enough to program keys, macros and lighting. But, the box says they had presets for FPS and MOBA (so the keyboard would highlight key buttons) but I can't find it anywhere in the software. The software updated the firmware pretty easy, compared to the ThermalTake Iris mouse. The Iris can't update the driver on the mouse for some reason, but at least the keyboard program is working. Also, this keyboard should be able to sync with Razer Chroma, but so far it doesn't work either and you'll have to continue using TT RGB Plus or TT X1 RGB software to control lighting.
Overall, hardware is great, but the software from ThermalTake is passable at best, but a buggy mess if you get a ThermalTake product that doesn't wanna update properly.
Images in this review