Features: Professional for QLAB controller There are one knob and three buttons It supports two computers (a host computer and a backup computer) 2 main control chips are used Its knob outputs synchronous digital signals The controller supports a variety of commonly used player software It can be used with video software that supports shortcut operation For QLAB, Hirrender p1, , Itunes, KUGOU music, KUWO music, QQ Music, foobar2000, etc. With setup software for and Simple and easy to use Preset schemes can be loaded with one click Color: Black Material: plastic Package Contents: 1 x Controller Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.