The DDJ-SR delivers many of the superior performance features of the top-flight 4-channel , including a built-in Serato sound card, large jog wheels and Slip Mode. But with 2 channels and support for USB power, the smaller, lighter DDJ-SR is ideal for Serato DJ users that want to take the performance with them wherever they go. Pioneer’s DDJ-SR 2-channel DJ controller is designed for use with Serato® DJ software. The smaller and more compact DDJ-SR inherits many of the same functions and controls of the larger DDJ-SX introduced in 2012, offering large aluminum jog wheels, integrated performance pads, and a new PAD PLUS feature that adds four additional audio effects to the performance pads..