The EG360 Retro-Reflective Photo-Eye is designed to provide ONLY vehicular entrapment protection for gates, barriers and overhead doors. It is NOT to be used for personnel protection. It uses an Infrared beam that is returned from a reflector mounted on the opposite side of the opening that detects vehicles in the beams path. The EG360 Retro-Reflective Photo-Eye is intended for use with operators designed to accept a “Heartbeat” form of monitoring but can be used with a operator’s simple relay contact activation for monitoring to comply with the UL 325 standard. It can also be used as a normally open non-monitored detection device for vehicular protection.