Electric Door Strike
Regular wall-mount push to exit buttons
If the power is out you want to keep your doors locked.
That's where backup batteries come into play.
Sometimes the building provides them but typically they are installed in combination with every larger access control system as an extra layer on top.
Typically the batteries will make sure to provide extra hours of backup power to keep everything safe and secure while there is an outage going on.
Elock Emergency Exit
Elock Power Supply
Electric Bolt YB-500U