The Keywiz- Door Lock Reminder-Works for all deadbolt locks and keyed doorknobs. With this new home security item, you can have peace of mind knowing that your door is locked even when you are miles away. The Key Wiz lock reminder automatically registers every time you lock the door. No more trying to guess if your door is locked. Works on all kinds of house locks that use a key- deadbolt locks, master locks, keyed doorknobs, padlocks Add security to your home and help prevent intruders from entering. Perfect gift for parents, seniors, gadgets lovers and anyone with ocd