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The locks can log the times of entry, and can trigger an alarm if they are struck during a break-in attempt. Deadbolts — unlike common spring latches, the locking mechanism of these typically prevents the bolt from being retracted by force, or shimming, and it cannot be moved to the open position except by rotating the key.
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Some lock manufacturers also have a "lockable" knob: a key is always needed on one side (usually external), and a twist knob can be used on the other (internal), unless a button has been pressed, in which case a key is also needed on the internal side. [3] A variant of the standard deadbolt is the vertical deadbolt, invented by Samuel Segal.
Historically, such locks were intended for use at night-time, hence the name. [5] The keyless egress that they offer is a valuable fire safety measure, but may be a security risk if breaking a glass panel (usually in the door) or a nearby small window allows an intruder to reach the knob inside and open the door from the outside.
Think of your account password and the verification code as working together, similar to a doorknob lock and a deadbolt. If you unlock the doorknob but not the deadbolt, you can't get inside.
In May 2013, August released their first smart lock. [4] The lock had a metal frame and was controlled using Bluetooth 4.0 with a smartphone app. [5] As with other August door locks, the device clips on to an existing deadbolt on the inside portion of a door, still allowing the use of a traditional key. [6]
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