Speco's multi-use 20 watt RMS AC/DC amplifier can be used as a 12V DC mobile or use 117/220V AC and 220/240V AC with 50/60 Hz. It features two microphone inputs that accept 1/4 inch phone plugs, two auxiliary inputs and tone control. It handles up to 60 watt music power or 20 watt RMS @ 5% THD. It has an output impedance of 4, 8, or 16 ohms with 70 and 25 volt lines. The input for microphone one is (LO-Z) 2mV/600 ohm. The input for microphone two (HI-Z) is 2mV/50k ohm. The input for auxiliary one is 200mV/100k ohm. The input for auxiliary two is 200mV/100k ohm. Technical Specifications Controls 2-Mic / 2 Aux / Tone / On/Off Power Dimensions 4-1/2"(H) X 10"(W) X 8-1/2"(D) Frequency Response 100 - 18,00 Hz Inputs Mic 1 - LO Z Mic 2 - HI Z (2 Aux) Max Power 60 Watts Mounting Brackets Included Noise Mic > 50 dB / Aux > 55 db Outputs 4, 8, 16 Ohm / 25 & 70V line RMS Power 20 Watts Sensitivity Mic 2mV / Aux 200mV THD @ Rated RMS Less than 5% Weight 10 lbs