Feature: 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). Package List: 1 x Keyboard (Ship with Inbuilt Battery)1 x USB Receiver1 x Type C Cable6 x Footpad1 x User Manual