Cooler Master CK721 Wireless Mechanical Keyboard Review

My stack of mechanical keyboards seems to be steadily growing lately, and between review units and crowd-funded products, I’ve begun quite the collection. The latest keyboard added to the stack is the Cooler Master CK721, a 65% RGB keyboard with three connectivity options and some really great aesthetics to go along with its function. Whether you are aiming to gain some desk space by switching to a smaller keyboard, looking to gain some imaginary internet points for cool looks, or just trying to make the move to a keyboard that offers form and function, the Cooler Master CK721 might be what you’ve been looking for. Follow along as I take a closer look.

Special thanks to Cooler Master for providing the CK721 review sample!


Switch Type: Mechanical, TTC Red/Blue/Brown
Keycap Material: ABS Plastic, Aluminum
Keycaps: Laser Engraved, OEM< Profile
Keyboard Color: Space Gray, Silver White
Keyboard LED Color: RGB, 16.7 million colors
Keyboard Polling Rate: 1,000Hz (Wired/2.4GHz Mode), 125Hz (Bluetooth)
Keyboard Response Time: 1ms (Wired/2.4GHz Mode), 8ms (Bluetooth)
On-The-Fly System: Yes
Keyboard Multimedia Key: Through Function Key (FN)
Connectivity: Wired, 2.4GHz, Bluetooth 5.1
Charging: Wired
Battery: 2000mAh
Battery Life: 73 hours (LEDs off)
Programmable: Yes, MasterPlus+

Weight: 764g
Dimensions: 334mm x 118mm x 37mm
Cable Length: 1.8m
Detachable Cable: Yes
Switch Travel: 4mm
Switch Operating Force: 45g (Red), 60g (Blue), 55g (Brown)
Switch Lifetime: 50 million actuations
Wrist Rest: Cloth/SBR, 334mm x 95mm x 18mm
Number of Keys: 67, 1 Dial


The CK721 comes packaged in a mostly white box with a matte finish and glossy imagery. A large image of the keyboard and included wrist rest takes up most of the top panel of the box, and is joined by a few icons indicating that this is a mechanical keyboard, with linear switches, RGB lighting, Bluetooth, and support for Cooler Master MasterPlus+ software.

Cooler Master CK721

The backside of the box has an angular view of the keyboard, with multiple call-outs that list and describe some of the more notable features of the CK721.

Cooler Master CK721

Cooler Master provided the CK721 with a nice and cozy box interior that does a great job of protecting the keyboard during transportation, and keeps the included accessories in their place as well.

Cooler Master CK721


Included with the keyboard is a cloth-topped foam rubber wrist rest with a small Cooler Master logo on it, a 1.8m braided USB-A to USB-C cable, a 2.4GHz dongle, USB cable extension adapter, keycap puller, and Quick Start Guide.

Cooler Master CK721 Cooler Master CK721