zalati Mechanical Keyboard, 12-Key USB Mini Programmable Keys No Drive Needed with Knob Design Easy to carry 2.97 x 5.14inch - Black12 programmable keys, to active the complex combination shortcut keys by One click. Knob design, which can volume plus or minus, pause, play and other functions. USB interface, plug and play, no any drive needed. Mini size, easy to carry on the go. Easy to operate, no conflict when connecting multiple keyboards. Suitable for office, game, music, media, industrial control, laboratory, production line testing and other fields.