The first one I bought, I had a locksmith install it. Unfotunately the re-keying did not work, then the battery died within a few weeks. Booked another locksmith to open it - they couldn't, so they destroyed the lock, and we finally regained access to the room. 

I bought a replacement, the exact same product, and the exact same thing happened. Re-keying failed, battery died after 5 weeks, and we now can't get into the room.