System Sensor-2151-CH Smoke Detector Head

System Sensor 2151-CH Smoke Detector Head, Photo, Low-Profile – Made in China UL Listed. Plugin Detector Base part is B401-SS. 1151 and 2151 are low-profile ionization and photoelectric, plug-in type smoke detector heads. They offer superb performance and reliability, meeting the stringent performance criteria designated by UL 268 and ULC, in a profile of just 1.66″ (42 mm). Aesthetically pleasing to engineers, architects, building owners and homeowners, the 1151 and 2151 can be used with four different adapter bases in a variety of wiring configurations and voltages. Model 1151 (ionization sensor) and 2151 (photoelectronic sensor) share the same sleek low-profile design.