|With a long-range sensing distance, the Monitored Retro-Reflective Photo Eye (LMRRU) delivers a more versatile solution in almost any application. Integrated diagnostics with our 2016 UL 325 Gate Operators. Easy to install and align with LED indicators. Solar optimized, turns off when gate operator is idle. LiftMaster’s full line of safety entrapment protection accessories are tested and proven to work together with our gate operators as a complete UL 325 compliant system.