• Built-in siren • Input: 1 x MIC & 1 x AUX • Power supply: 12VDC • Frequency response: 150HZ-15KHZ • Sensitivity: 75dB • Mic & aux volume • Output Impedance/Line: 4 – 16Ω • Output Power : 18 Watts RMS / 36 Watts Max   Read more Audien SM-203 12Volt car microphone amplifier with a power of 36Watt. It has 1 microphone input and 1 AUX input to connect an audio source like the vehicle source itself to use recorded messages and music. It works with the car battery with a load capacity of 4 – 16 Ohm. Ideal for announcements with a vehicle or mobile sales units such as vendors, sellers of popular markets, etc.