Child resistant up to roughly 5-6 year olds. Non-marking and no screw holds required (great for rentals). Metal back slides behind deadbolt and the plastic cover attaches to that. Squeeze and twist grey parts to lock and unlock. Can still be locked and unlocked from the other side with a key.
We also have two plastic covers for round door knobs to give away. These are child resistant for younger kids up to 3, maybe 4 years old.
