4-Channel half-rack stereo line mixer; USB interface for connecting with computers or tablets; XLR-1/4" balanced microphone input; Stereo line channel with RCA, 1/4" and 1/8" ( 3.5 mm) inputs; Bluetooth connectivity to wirelessly stream from a mobile device; Samson XPD Series USB Port (wireless system sold separately); Voiceover control with priority ducking and variable hold time; Rackmount kit and power adapter included