After being installed for a year, this electronic deadbolt stopped working in cold weather. It had new batteries installed and it would work for a day, and then stop working the next day. We punched in the correct code, and it just beeps like you have the wrong code. Also, turning the manual deadbolt with the key is tricky. You have to follow the specific instructions in the manual. It is not as simple as putting the key in the hole and just turning.