DJTECH MIXFREE DJ Mixer .100% Easy: Automatic linking and mixing Push button sounds and effects.100% Mobile: You can mix while moving around.100% Wireless: Controls the PC/MAC via a radio receiver on the USB port .100% Fun : On board all Pro features with innovative interface.Ultra-compact & lightweight:.DIMENSIONS 256.5(W) x 161.65(D) x 44(H) mm .WEIGHT 0.63kg.Battery powered: LR14 (C size), 1.5V2