The EMX NIR-50 is a retro reflective photoeye that can be used a safety reversing device for commerical door openers, automatic gate openers and parking barriers.  This unit has a detection range of 50 feet and includes the senor (reflector sold separatly).  The  unit offers flexible voltage options (12 – 240V) and is prefect for applications where power is only availble on one side of the opener and its low current draw (28 mA) makes it the perfect unit for solor or low voltage applications.