The Studio 22+ interface includes: Mono input for instrument / microphone: Balanced XLR and Balanced Jack Phantom power with ON / OFF switch and LED Potentiometer responsible for gain Line / Instrument Stereo Input: Dual Jack 6.35mm (Balanced / Unbalanced) Volume control with LED signal indicator USB stereo audio port: BUS stereo channel Potentiometer to adjust the volume MAIN MIX stereo output: Double Jack (Balanced / Unbalanced) Adjusting the MAIN MIX output level "Hi-Z" impedance switch Stereo headphone output: Jack connector Regulation USB stereo port: BUS stereo channel Characteristics: Power LED Compatible with Mac OS Compatible with Windows USB powered Can be supplied with an external DC 5V / 500mA power supply 3-pin XLR connectors, standard IEC 60268 Power consumption: 2.5W Dimensions: 109 x 52 x 104mm Weight: 0.5 kg