EMX NIR Retro-Reflective Photo Eye with 3 inch Reflector, Can be used as a reversing sensor for commercial overhead doors, gates and parking.., By Brand EMX EMX's NIR Plus is a Retro-Reflective garage door or gate operator Photoeye. The NIR Plus has an extended range of 45 feet to provide better performance in the rain and snow compared to the standard NIR model. The NIR Plus is ideal for heavy duty installations and has a watertight construction that protects it from the elements. It's retro-reflective style uses a single transmitter and receiver with a 3-inch reflector disk installed on the opposite wall, door jamb, or post. Each NIR Plus Photoeye comes with a reflector hood to protect the reflector from debris, a mounting bracket, and metal transmitter/receiver hood.