955 Commercial Grade Electronic Lever, Satin Nickel was pretty easy to install with the supplied instructions. It is very solid and not cheap feeling at all. It comes with the keys and a 9 volt battery that is said to last 3 years. Also the battery is super easy to change. Just pop off the plastic piece on the inside top and pop the old battery out and the new one right back in. It was easy to set up the codes and has up to 30 code options. This is perfect for a business or home. I just wouldn’t use this as a door lock that has small kids in the home due to the safety feature of opening from the inside whether it is locked or unlocked. Overall it is a great lock and we have really liked it. It is perfect for a business so you do not have to give employees the keys to your business, just change the code when they are no longer employed with you.