Compatibility: The 41A4373A sensor is compatible with openers from 1993 to the late '90s and supports residential and commercial ATS models, provided they are already equipped with sensors. Upgrade: Made of high-quality ABS, the 41A4373A door sensor is rigorously tested for durability and reliability. It features a label for visibility in industrial settings and has a 30-ft operating range. Installation: The 41A4373A infrared eye safety sensor features a center hole for bolt mounting to a bracket, allowing quick setup. Turn off the opener's power before installation. Includes: Each sensor has a green light and center bolt for alignment. The set includes a sender, receiver, and wire connectors. Brackets are not included. Note: This is a third-party accessory. Brand names are used for reference only. We aim to provide high-quality products. Color: Black Material: Plastic Package Contents: 2 x sensors, 1 set of accessories Note: Light reflection and different displays may cause the color of the item in the picture to appear slightly different from the actual item. Measurement may vary by +/- 1-3 cm.