You can customize the button to achieve keyboard function, mouse function, multimedia function, character string function, game function and macro definition function. USBandBluetooth 5.1 two-mode connection, easy to switch according to your needs. Designed with mechanical blue switches, strong paragraph sense, crisp sound. The button curve fits ergonomic design, comfortable to type. With anti-slip pads at the bottom, no need to worry about keyboard slipping. This product provides ElfKey, a key customization software for or for systems, which can be used in a variety of systems, plug and play, and does not require resetting (If you need ElfKey software, please contact customer service before placing an order). Wide application, suitable for office, game, multimedia, etc. Type: Mini keyboard Key number: 4 Connection mode: USBandBluetooth Mechanical switch: Blue switch Interface type: Type-C Service life: 50 million times Working voltage or current: 5V 15mA Colour:Black Material:ABS Package Contents: 1 x Mini keyboard 1 x USB data cable(The color of the USB cable is random, no specified color is accepted) Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is 1-3cm.