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2. Electromagnetic door holder - Wikipedia

   en.wikipedia.org/wiki/Electromagnetic_door_holder

   An electric current typically energizes the electromagnet to attract and hold the steel plate, keeping the door open. Unlike electromagnetic locks, the magnetic attraction of an electromagnetic door holder is usually weak enough that it can be manually overpowered at any time by anyone, allowing the door to close. [citation needed]

3. Electromagnetic lock - Wikipedia

   en.wikipedia.org/wiki/Electromagnetic_lock

   Quick to operate: Magnetic locks unlock instantly when the power is cut, allowing for quick release in comparison to other locks; Sturdy: Magnetic locks may also suffer less damage from multiple blows than do conventional locks. If a magnetic lock is forced open with a crowbar, it will often do little or no damage to the door or lock.

4. Magnetic keyed lock - Wikipedia

   en.wikipedia.org/wiki/Magnetic_keyed_lock

   A magnetic keyed padlock A magnetic keyed padlock. A magnetic keyed lock or magnetic-coded lock is a locking mechanism whereby the key utilizes magnets as part of the locking and unlocking mechanism. Magnetic-coded locks encompass knob locks, cylinder locks, lever locks, and deadbolt locks as well as applications in other security devices.

5. 55 Cool Tech Gadgets Our Gear Editors Loved Testing This Year

   www.aol.com/lifestyle/40-wildly-innovative-tech...

   Top Home Gadget: GeekTale Smart Fingerprint Door Lock, $40 Top Everyday Gadget: Belkin 3-in-1 Charging Stand , $120 Top Camping Gadget: VSSL Insulated Flask , $60

6. Crash bar - Wikipedia

   en.wikipedia.org/wiki/Crash_bar

   Crash bar doors in a school, with upper vertical rod latches. A crash bar (also known as a panic exit device, panic bar, or bump bar) [1] [2] is a type of door opening mechanism which allows users to open a door by pushing a bar.

7. Electronic lock - Wikipedia

   en.wikipedia.org/wiki/Electronic_lock

   Electric locks use magnets, solenoids, or motors to actuate the lock by either supplying or removing power. Operating the lock can be as simple as using a switch, for example an apartment intercom door release, or as complex as a biometric based access control system. There are two basic types of locks: "preventing mechanism" or operation ...