The Sonic Systems SONEM 2000 TRAFFIC SIGNAL PRIORITY SUPPORT SYSTEM for emergency vehicles uses sound instead of light. It detects yelp, wail, and hi-lo sounds. Requires no vehicle retrofitting. Maintenance-free and easy to install, it`s designed for use in NEMA TS-1/ TS-2 and CalTrans 170 cabinets. Its microprocessor-controlled, digital solid-state design is manufactured in ISO 9000 facilities, and is compliant with UL Labs, CSA, and with FCC limits for a Class A digital device.
Web site: www.sonic-systems.com.
(800) 337-6642.