An inexpensive supplement to your standard car horn• Delivers 100 watts of power to a 100 watt siren speaker (purchased separately)• Can be wired remotely to the horn ring of the vehicle or to a (customer supplied) switch• Sturdy amplifier housing mounts in the trunk, under the seat, or other remote locations• Can be used with standard 100 watt siren speakers including Whelen SA315P. • Draws 8 amps at 12.8 VDC• Output: 8 amps @ 100 watts with 1 speaker• Dimensions: 2-5/16" (59mm) H x 5-9/16" (141mm) W x 5-3/8" (136mm) D. With mounting feet: 6-15/16" (175mm) W