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products > > Access Control             The lock unit             A variety of locks can be utilised, the 2 common types are: An electro-mechanical release fitted to a night latch. A magnetic lock fitted to the top of a door. Locks can either be configured to be fail open or fail locked. Fail open- in the case of a power failure, the door attached to the system will be opened. Fail locked - in the case of a power failure, the door attached to the system will be locked. If a battery backup is fitted, the door would continue to operate normally in the event of a power failure.