Dimensions: 2 1/4"H x 6"W x 6 1/2"D This siren from SHO-ME features 12 operational modes: air horn, phaser, intersection mode, tap, radio re-broadcast, standby, wail, yelp, high / low, warble, whoop, and PA. Powder-coated steel housing has an illuminated control panel with a rotary switch for mode selection, three push-button momentary switches for air horn, phaser and intersection modes, and an on/off volume switch. Park function (optional) deactivates siren tones when vehicle is shifted to park. Control panel lights flash when Park function is engaged. PA and air horn modes continue to be operable while in Park mode. This solid-state siren powers one 100-watt RMS speaker. Comes complete with one hard-wired, noise-canceling P.A. microphone; one bale mounting bracket; convenient plug-in connectors and all necessary wiring.