The Able 2/Sho-Me 100 watt full-feature plus siren has 12 operational modes. It is horn ring compatible and has an illuminated face. It includes a bail mounting bracket, hard-wired, noise-cancelling P.A. microphone, plug-in connectors and all necessary wiring. Dimensions: 2 1/2"H x 6"W x 6 1/2"D.