The Whelen Gamma Siren is a highly versatile, hands-free siren system tailored for emergency vehicles, offering ease of use and reliable sound output. Compliant with SAE Class A and California Title XIII requirements when used with a 100-watt speaker, it provides exceptional audio performance in critical situations. With 23 customizable Scan-Lock™ siren tones, the Gamma Siren allows for tailored responses to various emergencies. Two 20-amp auxiliary rocker switches with LED indicators make it easy to control additional equipment. The stand-by button supports hands-free operation from the horn ring, while dedicated tone buttons for Wail and Airhorn offer quick alerts. The manual button enables users to activate up to three pre-selected tones. Installation is straightforward, thanks to its standard bail-strap mounting bracket, making it a practical solution for any emergency vehicle.