His amount of memory is designed for sixteen keys.

Electronic lock equipped with a controller, a fundamentally new locking device. Each, without exception, is assigned a completely individual number, the fake of which is impossible. Before starting the use of the castle, it must be registered in the lock controller. His amount of memory is designed for sixteen keys. If the key suddenly turned out to be lost, it is enough just to remove it from the database. One and that key can be registered in different locks, and therefore the homeowner does not need to mess with an armful of keys.