In plain words
Smart lock installation puts an electronic deadbolt or lever on your door that opens with a code, a phone, a fob or a fingerprint, and, on some models, a conventional key too. The locksmith confirms you control the property, measures the door and its holes, and makes sure the bolt travels freely, because a battery motor has less strength than a hand. The hardware is fitted with a solid strike, the maker's specified batteries go in, and the lock is set up under your own account. You leave with codes working and, on a keyed model, the override key tested and the old key retired.