system sensor 2151 for sale, brand-new and used.

QTY 9) SYSTEM SENSOR 2151 PHOTO ELECTRIC SMOKE DETECTOR System Sensor 2151 Low Profile, Plug-in Photoelectric Smoke Detector Technical Specifications: Operating Voltage: (Mounting Base Dependent) Alarm Current: (Mounting Base Dependent) Dimensions: 2.0" (51mm) H x 4.1" (104mm) Dia. (unflanged base) or 6.1" (155mm) Dia. flanged base Detection: Photoelectric Operating Temperature Range: 32 degrees to 120 degreesF (0 degrees to 49 degreesC)