Fischer Amps In Ear Body Pack XL, In Ear BP Headphone Amp, 2 x XLR Input, 1x XLR Mic Intpu, 1x XLR MIC Thru Out, Stereo/Mono/Mixed application, Mic Gain with LED meter, Pad - 16 dB, + 48 Volt, Volume-leveler, Balance/Mix leveler, 3.5mm stereo-jack headphone output, 40mW output power, internal limiter, workds with one 9V battery, 6 h with NIMH Akku 170 mAh, 12 h. with Alkaline batteries