The 295 Series Full Function Siren/Heavy Duty Microphone from "Whelen Engineering" has 100 watt and heavy-duty microphone with 12 VDC. This self-contained unit for under-dash mounting and adjustable preset microphone volume, adjustable preset radio repeat volume. With hands-Free" operation. Turn On/Off and access all three siren tones (default Wail, Yelp, and Pierce) without taking hands from the steering wheel.