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2. UniKey - Wikipedia

   en.wikipedia.org/wiki/UniKey

   [1] [2] Dumas previously worked to develop SmartScan, fingerprint-reading residential deadbolt lock which Dumas described as too unreliable. He started UniKey to sell locks which use smartphone technology to open locks instead of physical keys. [1] [2] [3] In May 2012 Dumas and UniKey Technologies appeared on ABC's reality series Shark Tank. [4]

3. Fingerprint scanner - Wikipedia

   en.wikipedia.org/wiki/Fingerprint_scanner

   The measure of the fingerprint image quality is in dots per inch (DPI). [8] Optical scanners take a visual image of the fingerprint using a digital camera. Capacitive or CMOS scanners use capacitors and thus electric current to form an image of the fingerprint. This type of scanner tends to excel in terms of precision.

4. Smart lock - Wikipedia

   en.wikipedia.org/wiki/Smart_lock

   Industrial smart locks (passive electronic lock) are a branch of the smart lock field.They are an iterative product of mechanical locks like smart locks. However, the application areas of industrial smart locks are not smart homes, but fields that have extremely high requirements for key management, such as communications, power utilities, water utilities, public safety, transportation, data ...

5. 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.

6. Door closer - Wikipedia

   en.wikipedia.org/wiki/Door_closer

   [citation needed] The latter include retina scanners, fingerprint readers, and voice recognition technologies. [28] Electric door closers may also be hooked to a building’s fire alarm system. A triggered alarm cuts power to any electromagnetic hold-open device, allowing the doors to close. [29]

7. Here’s Why You Should Close Your Bedroom Door at Night - AOL

   www.aol.com/lifestyle/why-close-bedroom-door...

   If you shut your bedroom door at night, you hear less noise and have more privacy. However, if you leave it open, there is better air circulation and you can hear what the kids are doing. But the ...