Built-in Bluetooth 5.1 chipset: You can connect up to 3 devices via Bluetooth, and easily switch between them via FN + Q/W/E. It also has a wired mode with USB Type-C connection. RK61 is most suitable for smart phones, laptops and tablets. $ 60% mechanical gaming keyboard: A compact mechanical keyboard with 61 keys brings you a neat desktop. The tip you might want to know is that the 60% Bluetooth gaming keyboard without a small keyboard is the choice of most FPS gamers, leaving more room for mouse movement. $ Hot-swappable: Hot-swappable PCB allows you to freely replace the 3-pin/5-pin switch without soldering problems. Enjoy the fun of making your own unique keyboard. $ 1450mAh battery: RK61 60% mechanical keyboard allows you to use it continuously for about 13 hours, with the lightest backlight, up to 360 hours of standby time. $ Monochrome backlight is not dim: even if RK61 does not have multi-color RGB but only single LED backlight, 17 dynamic backlight modes can maintain a flat effect. Use FN+ to select your ideal mode and freely adjust the brightness and luminous speed.