Features: 1.Three Connection Modes: Mini keyboard with custom function, support Type C wired, Bluetooth, 2.4G wireless three ways to connect, can be freely switched, no driver. 2.3 Adjustment Knobs: 3 knob design, the knob has a click function, can be used as a mouse left and right keys. The knob can be set to zoom in and out, cut the song previous, following volume plus, volume down, pause, play and other functions. 3.Programmable: The keyboard is programmable, supports up to 18 characters of shortcut key overlay, one key output, easy to operate, no tedious steps. 4.Supported Systems: Keyboard with storage function, set for for Windows system, can be used on systems that support USB protocol, such as for Linux, for OS X, etc. 5.Applications: Programmable keyboards for office, gaming, music, media, industrial control, laboratory, production line testing, etc. specification:Item Type: USB Mini 15 Key Keypad Material: Acrylic, ABS Color: White Number of Keys: 15 Keys Switch: Mechanical Blue Switch Knob: 3 Connection: Type C wired, Bluetooth, 2.4G Wireless Battery Type: 300mAh Lithium Ion Battery (Ship with Inbuilt Battery) PackageList: 1 x Keyboard(Ship with Inbuilt Battery) 1 x USB Receiver 1 x Type C Cable 6 x Footpad 1 x User Manual