Studiologic SL Mixface, USB MIDI controller, Ideal supplement to the SL master keyboards to extend their control options, 9 Faders, 8 Knobs, 8 Buttons, Transport button: Rew / FF / Stop / Play / Rec, Cycle button, Connections: Micro USB (Device) and USB A Host, Powered by micro USB or AAA batteries, Bluetooth: 4.2 Low Energy, Dimensions (W x D x H): 262 x 130 x 36 mm, Weight: 570 g (without batteries), Includes collection of virtual instruments after registration of the hardware