Able 2 Prducts 100 Watt Slim Siren Is a Must For Dash Mounting In Vehicles With Very Little Room Under The Dash! This AttentionGetter Comes Complete With Center Off Switch For Wail And Yelp, Plus a Momentary Switch For Air Horn. Mounting Bracket Included. Meaures: 6"L x 1.5"H x 5.5"W.