How to Use: Wired connection: plug and play BT connection: long press connect for two seconds, the red and blue lights flash to enter the pairing mode, and the computer can turn on the BT connection Specification: Item Type: Single Foot Switch Pedal Material: ABS Connection Type: Wireless BT, Wired USB Number of Keys: One Digit and Two Keys Switch Type: Mechanical Switch Battery Type: 2xAAA Batteries ( Not Included) Compatible Systems:For Windows, for Linux, for OS X, for Android (if It is a for Linux or for OS X, You Need to Modify the Button Definition in for Windows, and then Plug the Switch into for Linux or for OS X to Use) Package List: 1 x Single Foot Switch Pedal1 x Data Line 1 x English User Manual