This 100 Watt Electronic Air Horn features a high gain microphone and public address capability with adjustment for PA volume. An inexpensive supplement to your car horn sound level with a legal (in most states) air horn tone. The same familiar airhorn sound used by Police, Fire & EMS. Perfect for volunteers that are not allowed to use siren tones. Can be wired remotely to the horn ring of the vehicle or to a (customer-supplied) switch.