The effeff 843 door deadbolt's compact design and sophisticated accessories enable it to be fitted in a variety of locations. It thus can offer optimum security as an additional door locking system in both commercial and private buildings.
Fail unlocked use, switchable 12/24V operation.

For horizontal and vertical fitting. When fitted horizontally, only possible to close downwards.
Can also be fitted to the surface of glass doors.
Automatic unlocking for 8 seconds via integrated control.
Integrated door and locking monitoring contacts. Suitable for both short and permanent release.
Suitable for revolving and swing doors. In order for the deadbolt to function properly, a striking plate with a magnet to detect the door status is necessary.