Features: 1.Connection Mode: 3 knob 15 key mechanical keyboard supports Bluetooth and USB 2 connection modes with automatic switching. 2.Good Helper: Knob with click function can be used as the mouse button, and can be set to zoom in and out, change the song, volume up or down, pause, play and other functions. 3.Supported System: 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. 4.Easy Operation: Keyboard supports up to 18 character shortcut key overlay, one key output, easy to operate, no tedious steps. 5.Application: Suitable for office, games, music, media, industrial control, laboratory, production line testing and other fields. Specification: Item Type: Programmable Keyboard_x000D_ Material: Acrylic, PCB_x000D_ Connection Mode: Bluetooth /USB_x000D_ System Support: for Windows, for VISTA, for Linux, for OS X_x000D_ Button Life: Up to 50 million times_x000D_ Light: RGB_x000D_ Type: Dustproof green shaft_x000D_ Key Number: 15 keys_x000D_ Product Size: Approx: 185x77x39mm/7.28x3.03x1.53in_x000D_ Current Voltage: DC 5V/1A_x000D_ Operating Temperature: -10-50_x000D_ Battery Type: 400mAh lithium battery x1 (built in)_x000D_ Shortcut Key Overlay: 18 characters_x000D_ Suitable for office, games, music, media, industrial control, laboratory, production line testing and other fields. PackageList: 1 x_x000D_ _x000D_ ProgrammableKeyboard 1 x USB Cable 1 x User Manual Note: 1. Please allow slight error due to manual measurement. Thanks for your understanding._x000D_ 2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.