About This Compatibility: This 41A4373A garage door openers safety sensor ensures seamless compatibility with LiftMaster and chamberlain garage door openers manufactured between 1993 to late 1990s. Replacement aftermarket parts for safety sensors 41A4373A Enhanced Safety & Durability: Dual infrared beam alignment technology prevents false triggers. Infrared beam system automatically reverses garage door if any obstruction breaks the sensor beam during door closureWeather-resistant casing withstands extreme temperatures (-77°F to 185°F) and moisture Easy to install: No professional tools needed! The 41A4373A sensors with 3FT wires can be simply spliced into your existing wires,plug-and-play design with instruction manual is very detailed , no professional tools needed,One person can complete the installation manually, saving you installation costs Package Includes: Package includes sending unit *1, receiving unit*1, screws and bolts*2, wire connectors*5 and instruction*1 ( Note :This Safety Sensor is only used for garage door openers that already have sensors installed) Good after-sales service: Our products come with a 2-year warranty. During this period, if you have any questions, please write to us and we will provide assistance within 24 hours! Overview Brand : ATEEfaee Item dimensions L x W x H : 3.14 x 1.57 x 1.25 inches Material : Acrylonitrile Butadiene Styrene Item Weight : 0.75 Pounds Style : Sensor-01