The SA-360 Defender Siren and SA-361Defender Remote Siren combine simple operation, reliable performance and rugged durability. Although the Defender sirens can be used in several different applications, they are engineered primarily for the volunteer firefighter market and for police motorcycle applications. Designed to work with a single 100-watt speaker, they are outfitted with Carson Siren's Horn Ring Cycler 2 or HRC2 feature. This feature allows the operator to cycle through the tones by tapping their steering wheel's horn or motorcycle's momentary siren switch and to shut off the siren by double tapping the horn or switch.