1、Performance: Multi function 12 keys custom keyboard, with 2 adjusting knobs, no cumbersome steps, support up to 18 characters shortcut key superposition, one key output, convenient and fast. 2、Dual Modes: Support USB and Bluetooth two connection modes, and automatically switch. If you plug in usb, it switches to usb mode, and if you pull it out, it switches to Bluetooth mode. 3、Multifunction: Knob has a click function, and can be used as the left and right mouse buttons, also can be set to zoom in and out, with a switch song, adjust the volume, play and other functions. 4、Compatibility: Type C to USB interface, plug and play. Keyboard with storage function, set up on for Windows system can be used on systems that support USB protocol such as for Linux, for OS X, etc. 5、Wide Application: Suitable for office, games, music, media, industrial control, laboratory, production line testing and other fields. Simple operation, easy to carry. 1 x Keyboard1 x USB Cable Item Type: One Handed Mechanical KeyboardMaterial: Acrylic, PCBApplication: Suitable for office, games, music, media, industrial control, laboratory, production line testing and other fieldsConnection Mode: Bluetooth, USBSystem Support: for Windows, for VISTA, for Linux, for OS XKey Life: up to 50 million timesType: Dustproof green shaftKeys: 12 keysProduct Size: L120xW115xH38mm/ 4.72x 4.52x 1.49inCurrent Voltage: DC 5V/1AOperating Temperature: -10℃-50℃Battery Type: 1000mAh lithium battery x1 (built in)