The 841LM works automatically with your garage door opener so it always locks and unlocks with every operation of the door. The model 841LM 12V lock is only compatible with the following garage door opener model numbers: 8550WL, 8587WL, 8360WL, 8500W. It is not interchangeable with the 24V lock used on residential jackshaft garage door opener models 3800, 3900 and 8500. Add a lock to each side of the door for the best defense against high winds and storms and intruders
View full description
Item# : SPM13655647617
Model # : 1