If you can change out a lock, you can put one of these in. Pay attention to the instructions (and never lose them) because they go step by step how to enter lock codes into the machine.
One of the most useful features is the auto lock-- you set the lock to automatically re-lock after some number of seconds (I picked 90 seconds). This means the kids can't forget to lock the door behind them when they leave for school in the morning.
Works great and only needs four AA batteries, meaning no expensive battery replacements down the road. Definitely worth the money. I'll heartily recommend it to anyone who isn't afraid of buttons.
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