3-Mode Connectivity - With 2.4GHz wireless, Bluetooth, and 3-mode wired USB, this is a wireless gaming keyboard that no longer limits how you can connect. Also, in Bluetooth mode, you can connect up to 3 devices. Compatible with Windows / MacOS / Android. 61-Key Compact Design: With no additional number keys, it can meet your needs in the office or home. The 60% mini mechanical keyboard is space saving and portable, you will be satisfied with how much space you save. Red: Linear. The result is a feel that most perceive as “smoother” and "faster" making them especially popular among Gaming enthusiasts. Brown: Slightly quieter and easier to trigger than the Blue Switch. Good tactile feedback, the audio feedback isn't quite as noticeable as Blue Switch. RGB Backlight: This 60% custom mechanical keyboard has 18 RGB backlight modes, 8 monochrome backlight modes, and 1 full color backlight. These light modes can provide you an enchanting gaming environment at night. Ergonomic Design- The RK61 is designed with 8 ° ergonomic angle which can help you to relieve stress effectively. The integrated wrist rest gives you the comfort you need for marathon gaming sessions. Material - ABS, Keycaps Thickness - 1.5 mm