1、15 Keys Mechanical Keyboard: 15 key custom keyboard, with 3 adjustment knobs, the knobs have click function, can be used as left and right mouse keys, support up to 18 characters shortcut superposition. 2、Bluetooth Connection: The keyboard is a dual mode keyboard, which supports Bluetooth and USB connection modes and switches automatically. If there is no operation for 15 minutes, Bluetooth will automatically enter the sleep mode. 3、Multifunctional: All key functions on the standard for Windows keyboard can be set, and complex shortcuts can be realized with one click. With storage function, it can be used on systems that support USB protocol such as for Linux and for OS X after being set up on for Windows systems. 4、3 Helpful Knobs: The knob can be set to zoom in and out, switch songs, play the previous song, next song, volume up, volume down, pause, play and other functions, which is a good helper. 5、Delay Function: You can set a delay of up to 6000 milliseconds. For example, after setting the copy and paste button, you can choose to delay 200 milliseconds before setting other commands. 6、Easy to Use: Mini keyboard with custom function, Type C to USB interface, plug and play. Simple operation, no conflict between multiple keyboards, with RGB function, a variety of light colors adjustable.