I'm so happy for the opportunity to say how delighted I am with this product. No more keys to fumble around in my purse for; automatic self-lock after 30-seconds so no forgetting to lock the door; extremely simple to install and program; easy to activate the lock if necessary quicker than 30-seconds. I live alone so always make sure my adult children have a key enabling them to get into my house when necessary. Invariably they misplace the key, put it up somewhere so it's never with them, etc. Now, only a code is necessary and it's with them and with me at all times. No one else has to know the code or where an emergency key is hidden. I realize every cure for one problem can always be overcome by someone and while I realize no safety feature can work for every situation, I feel so much safer inside my home after installing this electronic lock. I've had it since last December and haven't yet had a complaint.