Brand new and high quality. USB interface, plug and play, no driver required. DIY custom keyboard, set up any definition. Each button can be set to a different function mode without affecting each other. Button functions can be set by yourself, there is a special setting program, you can set it repeatedly. Onboard storage, settings are saved in the keyboard, if the device changes, no need to set it again. Support Windows, Linux, Android, Raspberry Pi, etc. Supported function modes include default mode, multimedia control, two-step operation, LED control, game controller, and one-key password.