>The batteries may die, which means there must be a physical lock as well I generally see a battery compartment on the exterior, so if the batteries die you ju

>The batteries may die, which means there must be a physical lock as well I generally see a battery compartment on the exterior, so if the batteries die you just replace them and then enter the code. Sometimes the key lock does something like immobilize the dial or handle, so it's a second factor, not a bypass. >Why pay all that money and get nothing in return? On consumer-level safes, who knows. Beyond that: individually identify users, revoke specific users, have an audit trail of who opened it when, make the ACLs depend on time of day.