You can customize the button to achieve keyboard function, mouse function, multimedia function, character string function, game function and macro definition function. USB+BT4.0 dual-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- pads at the bottom, no need to worry about keyboard slipping. This product provides key definition setting software based on Windows system, which can be used in systems after setting.(Note: If you use Linux or , you need to set it up on Windows first, then plug the foot switch into your device and run it to use) Wide application, suitable for office, game, multimedia, etc. Note: -click open/start function cannot be used in wireless mode. Type: Mini keyboard Model: MK321BT Key number: 3 Connection mode: USB+BT4.0 Mechanical switch: Blue switch Interface type: Type-C Service life: 50 million times Battery capacity: 140mAh Working voltage/current: 5V@15mA Item size: 7.5 X 3.7 X 2.8cm /2.95 X 1.46 X 1.1in Item weight: . 29g /1.02oz Colour:black Material:plastic Size:75 x 37 x 28mm Package Contents: 1 x Keyboard 1 x Data cable 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.