The Edwards 867STR AdaptaBeacon series is a bright, low current, high decibel, surface mount, combination electronic horn/strobe for indoor or outdoor use. It has been designed for mounting with the supplied back box. Strobe and horn may be operated independently. The 867STR mounts to the gray, corrosion resistant weatherproof surface box supplied with the unit. The box measures 5 5/8" (150mm) square by 3 5/16" (87mm) deep. The 867STR AdaptaBeacon is for indoor wall mounting in manufacturing sites. Used where a distinctive visual or audible signal is required for timing, scheduling, paging, process control, and general alarm applications.