Child safety locks  -  Door Chain Lock

A door chain, security chain, or security door chain consists of a small chain
attached to the door frame, which attaches to a track on the door for security
purposes

Door chains also can be set in place when the door does not need to be opened. They
can only be touched from outside when the door has been opened, and therefore, if
the locks on the door are compromised.


Advantages
Door chains are fairly easy to install and use. Use of a door chain improves
security when dealing with strangers. A properly installed door chain is resistant
to tampering from the outside. Using physical force to open the door will leave
obvious evidence.

peep holes, and mail slots can all serve purposes similar to the door chain when
dealing with strangers, and function without opening the door. Of course, these
devices do not provide additional protection to the door it
self.

Child safety locks

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