No Locking if battery is down (provided, the lock should mandatorily have battery inside even if the battery is down)
Specifications-
For Installation of this lock, need to calculate the thickness of the door + distance between both the doors in mm (total should not exceed 30 mm)
This lock has inbuilt packing for supporting upto 25mm thick door, for installing in: Door thickness< 25 mm, need to screw an external (wooden) packing between the rear door & the lock to make it uptill 25 mm. Door thickness > 25 mm, need to conceal the lock inside the rear door to make it uptill 25 mm.