Dimensions: 1 5/16"H x 6"W x 5 11/16"D This compact siren from SHO-ME fits in vehicles with cramped spaces so that you don't have to sacrifice space but can still get a great sounding siren. The four functions are operated with push on / push off switches. The switches for Phaser and Airhorn tones are momentary switches. Each switch has a red LED light that indicates which siren function is in current use. Standard 100 watt power for a speaker of your choice. Bale mounting bracket and installation wiring included with purchase.