This is a Silver Electronic Keypad Deadbolt Lock with Key Override.
This Electronic Keypad Deadbolt Lock can lock and unlock automatically. Instead of spending minutes searching your key from your bag, aiming at the key hole, and turning round the cylinder, the only thing you need to do is to input your door lock password, then the lock unlocks itself for you! It can also lock itself with a set timespan so you do not have to lock it if you are in a rush.
This keypad has proven very reasonable. The motor used for this I have noticed two types throughout the years. Other than beware of the battery lid that if not removed properly can grab the battery pack and break the wires for power soldered to it if pulled out. I have rarely had one out of many installed had problems after installation.