RK Royal Kludge RK61 Pro is the RK61 Upgrade Version, which is a RGB Mechanical Keyboard with 61 keys. It supports Bluetooth and wired dual mode connections to the device. It has various application designs, such as doubt shot injection PBT key caps, All keys without conflict, brilliant color backlit, control of hardware backlit, make your own key function and FN multi-function key combination. The most incredible is you can use the programmer make your own keyboard. It's made of CNC Metal Shell. It's heavry so it makes gamer more stable.