Dimensions: 2 1/2"H x 6 1/16"W x 6 1/8"D Siren Tones/Functions: Wail, Yelp, Piercer, Manual, Airhorn, Public Address, Radio Rebroadcast. Whelen's siren series 295HFS are all "Hands Free" sirens. These sirens allow you to select the siren tone needed by simply using the horn ring on the vehicle. You can choose from the basic SL100 model which is a economically priced 100W siren head, the 200W HFSA1 which also has a Park Kill feature, the 200W HFSM1 with the new Electronic Mechancial siren tone, or the premium siren and light control combination 200W HFSA6 which has both a Park Kill feature, gun lock timer and 9 switch light control. All models meet or exceed Class A requirements of SAE, AMECA, KKK1822, and California Title XIII. Each siren comes equipped with adjustable bail bracket and prewired microphone.