The device works by locking the trigger in place so that it cannot be pulled. This can help to prevent accidental shootings and can also make it more difficult for a child or someone else unauthorized to use the gun.
There are different types of trigger locks, but the most common type is a cable lock. This type of lock has a cable that runs through the trigger guard and then attaches to the frame of the gun.
Other types of locks include combination locks and keyed locks. Trigger locks are not foolproof, however, and should be used in addition to other safety measures such as keeping guns unloaded and locked up in a safe place.
