Features: Applicable models: Garage door sensor is suitable for linear garage door opener LSO50 LDO33 LDO50. Function: The sensor emits an invisible light inside the garage door, whenever there is an obstacle, the garage door will automatically reverse to avoid any damage and prevent accidents. High-quality materials: The shell is made of high-quality materials, which is -, wear-, not easy to age, and [Easy to install] This garage door sensor has a compact structure, is simple and convenient to install, does not easily occupy space, and saves a lot of time and cost. product description: When to replace: 1. There is no obstacle, but the garage door stops reversing 2. If the green light is on and the yellow light is off, replace the sensor 3. In cold weather and strong UV rays, the garage door will stop backing up Specification: Usage: direct installation Notice: 1. The installation height should not exceed 6 inches (about 15.4 cm) 2. Lenses should be aligned 3. The receiving sensor lens cannot receive direct sunlight Material: plastic+copper wire colour: black Package Contents: 1 set garage sensor (Accessories as shown) Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.