You can customize the button to achieve keyboard function, mouse function, multimedia function, character string function, game function and macro definition function. USB+Bluetooth 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 Windows/for Mac 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: USB+Bluetooth Mechanical switch: Blue switch Interface type: Type-C Service life: 50 million times Working voltage/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)