Profile: Audiotech Digital Signal Corp. is a supplier of warning sirens, siren controllers, telephone equipment, radio receivers and traffic control products. TrafficMaster 7000 is used by emergency vehicles to safely pass through any intersection controlled by a light. It is operated by pressing a button on the dash of the vehicle, and the TM-7000 transmits a command to the traffic signal to give a priority green light. It works best in a vehicle that passes through an intersection from the same direction each time (such as fire apparatus responding to an alarm). The intersection must utilize a traffic signal that can accept pre-emption programming. Model 2 is an omni-directional siren capable of producing a single tone sound level of 102dBC at 100 feet (on axis) while making moderate power demands. It can be easily mounted on any flat surface, roof, or utility pole. Brands include Vedette Siren Activation System™, Federal Warning Systems™ and Sentry Siren™.