Applicable Models: The garage door sensor fits for Linear garage door opener LSO50 LDO33 LDO50. When to replace: 1. There are no obstacles, but the garage door stops reversing 2. If the green light is on and the yellow light is off, please replace the sensor 3. In cold weather and strong UV rays, the garage door stops backing up Feature: - The shell is made of high-quality ABS plastic, which is corrosion-resistant, wear-resistant, not easy to age, and durable - Product package: 1×sending sensor (with amber LED and wire), 1×receiving sensor (with green LED and wire), 1×detailed installation instruction, 4×wire connector - If anything is unclear, please feel free to contact us, we will reply you within 24 hours, but please note that it does not include the garage door sensor bracket Specification: Colour: Black Material: plastic, copper wire How to use:Install directly Notice: 1. Mount height should not exceed 6 inches from the floor 2. The lens should be aligned 3. The receiving sensor lens cannot receive direct sunlight