The 2151 low-profile photoelectronic detector uses a state-of-the-art optical sensing chamber. This detector is designed to provide open area protection and to be used with compatible UL listed control panels only. The capability of plugging this detector into a variety of special bases makes it more versatile than equivalent direct-wired models. Also known as -System Sensor By Honeywell-Us LOW PROFILE PHOTOELEC PLUG-IN - BK-2151
