19 Keys and 3 Knobs: This mini gaming keypad is designed with 9 keys and 3 knobs. Featuring RGB backlit and dustproof blue switch. 2Knob Function: This programmable keypad has 3 knobs that can be set to zoom in and out, following song, the volume up, volume down, pause, play and other functions. 3Multi Function: This mini keypad possesses programmable function, storage function and delay function. Type C to USB interface, plug and play without driver. 4Delay Function: This 9 key gaming keypad also has delay function that can be set to a maximum of 6000 milliseconds. 5Wide Application: This 9 key keypad with 3 knobs is suitable for office, games, music, media, industrial control, laboratory, production line testing and other fields.