I had this lock installed when my purse with my house keys, wallet (with my driver's license and address), etc was stolen. It was awesome and worry free for 3 months. Then, out of the blue, it died one day. I have no idea why. However, this was installed by my neighbor who is does professional security system installations, so it is obviously a good product. I had him replace it and he replaced it with the same thing. So far, no further issues (only a couple weeks) and I don't anticipate any.