The IRB-325 photocell is an external entrapment protection, device-type B1, non-contact sensor for use with automatic gate operators. The IRB-325 produces a detection signal when the infrared beam is broken.Range: 6 to 65 ft. Power: 12V to 24V DC or AC 150mA. Relay Contacts: 30V 1A. Dimensions: H: 5.03, W: 3.06, D: 3.02. Operating Temp: -40F to +170F. UL-325 Compliant.