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This replacement safety sensor kit is used to replace the discontinued 41A4373A safety sensors. The 41A4373A sensors each had a green LED light. The 41A4373A sensors were used on Chamberlain branded garage door openers between 1993 and 1997. Each sensor shown has approximately 18′ of wire attached. Designed to splice into your existing wires. Wire connectors, fasteners, 41A5266-1 brackets and instructions included.