- For garage door openers that currently have sensors installed
- 41A4373A sensors are compatible with LiftMaster and chamberlain brand from 1993 – late 1990’s
- Each sensor has a green light and a bolt that runs right through the center of each sensor
- Designed to splice into your existing wires
- Includes 1-sending unit, 1-receiving unit, wire connectors and instructions – no brackets
