Ahuja 40 Watt Mobile PA Mixer Amplifier PA-400S is ideal for use with Mic MM-60M and Horn speakers SUH-25/SUH-40. It has 2 Mic & 1 Aux Input. 12V Car Battery Operation, two-tone siren (wailing & yelping) with volume control. It comes with a mounting bracket supplied and a power adapter. The unit is fitted with two microphones, one Auxiliary input, a two-tone siren (wailing & yelping) with volume control, a 12V Car battery operation, and an Amplifier mounting bracket. The amplifier is powered by a 12V car battery and can be used on Police vehicles, Crowd Control, Ambulances, Publicity Vans Electioneering etc.