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2. Combination lock - Wikipedia

   en.wikipedia.org/wiki/Combination_lock

   A Wordlock letter combination lock.. A combination lock is a type of locking device in which a sequence of symbols, usually numbers, is used to open the lock. The sequence may be entered using a single rotating dial which interacts with several discs or cams, by using a set of several rotating discs with inscribed symbols which directly interact with the locking mechanism, or through an ...

3. Rotary combination lock - Wikipedia

   en.wikipedia.org/wiki/Rotary_combination_lock

   Many combination locks have three wheels, but the lock may be equipped with additional wheels, each with a drive pin and fly, in a similar manner. The number of wheels in the mechanism determines the number of specific dial positions that must be entered to open the lock, so a three-sequence combination is required for a three-wheel lock.

4. Smart lock - Wikipedia

   en.wikipedia.org/wiki/Smart_lock

   A smart lock is an electromechanical lock that is designed to perform locking and unlocking operations on a door when it receives a prompt via an electronic keypad, biometric sensor, access card, Bluetooth, or Wi-FI from a registered mobile device. These locks are called smart locks because they use advanced technology and Internet ...

5. Padlock - Wikipedia

   en.wikipedia.org/wiki/Padlock

   A combination padlock. Combination locks do not use keys. Instead, the lock opens when its wheels are lined up correctly to display the correct combination. A padlock was invented by John I. W. Carlson in 1931 (a patent was granted in November 1934) that has both a combination on one side and a key on the other.

6. Remote keyless system - Wikipedia

   en.wikipedia.org/wiki/Remote_keyless_system

   A security concern with any remote entry system is a spoofing technique called a replay attack, in which a thief records the signal sent by the key fob using a specialized receiver called a code grabber, and later replays it to open the door. To prevent this, the key fob does not use the same unlock code each time but a rolling code system; it ...

7. 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.