Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Works, but it was a little tricky getting installed

I had to wiggle it a bit to actually make it work. Seems like the batteries were popping lose and that maybe it works on a frequency (sound) transmission. I messed around a bit with the battery compartment as well as literally wiggling it. Eventually I got it working properly and it continues to work properly.Someone asked about the screws on the outside of the door. Those screws keep the keypad on the door and do not allow actual access to the locking mechanism of the door. While it may be possible for someone to remove the screws and eventually figure out how to unlock your door, it would probably be easier for them to smash your door in, break a window, or do some other destructive action. If you are really concerned about someone invading your home, you should get a security alarm system. I doubt there is a lock on the market that is impervious to picking or breaking in, if the invader is determined enough.