Built-in Mp3/USB/SD player  siren , FM receiver & remote control  Input 2xMIC & 1xAUX  Power supply 220VAC & 12VDC  Frequency response 20HZ-20KHZ  Sensitivity :<75dB;  Mic control & aux volume.  Mic input unbalanced  Output Impedance/Line: 4-16Ω  Output power:18W   Read more Audien SM-201B microphone amplifier with 2 microphone inputs and 1 AUX input as well as built-in MP3/USB/SD Player, siren and FM receiver. With a power of 18Watt RMS load capacity from 4 to 16 Ohm and the ability to operate with the car battery (12VDC) or as a fixed with network voltage (220VAC). Suitable for announcements with vehicle or mobile sales units, vendors, sellers of popular markets, announcements of events and events, etc.  Built-in Mp3/USB/SD player  siren , FM receiver & remote control  Input 2xMIC & 1xAUX  Power supply 220VAC & 12VDC  Frequency response 20HZ-20KHZ  Sensitivity :<75dB;  Mic control & aux volume.  Mic input unbalanced  Output Impedance/Line: 4-16Ω  Output power:18W