1、Bring You Convenience: 4 key keyboard, which can set all the key functions on the standard for Windows keyboard, with adjustment knob, user defined, and support up to 18 character shortcut key superposition. 2、Delay Setting: The delay function can be set to 6000 milliseconds at most. For example, you can choose to delay 200 milliseconds and set other commands after setting the copy and paste button 4、With RGB and Easy to Use: Mini keyboard with customized function, Type C to USB interface, plug and play without driver, with RGB function, and various light colors can be adjusted. 5、Storage Function: The keyboard has storage function, which can be used on systems such as for Linux and for OS X that support USB protocol after being set on for Windows system. 6、Applicable Scene: Programmable keyboard is applicable to office, games, music, media, industrial control, laboratory, production line testing and other fields. 3、Knob Can Be Set: The knob has a click function, which can be used as the left and right mouse buttons. It can also be set to zoom in and out, play the previous song, the next song, volume up, volume down, pause, play and other functions.