Digital Keypad Door Lock

A keyless lock for homes and offices that want to stop handing out duplicate keys. Entry is by a four to eight digit PIN on a backlit touch keypad, or by an RFID card tapped on the face. Up to twenty separate codes can be stored, so you can give the maid, the tenant or the staff their own code and delete it later. It runs on four AA batteries for roughly a year and warns you well before they run down; a mechanical key is supplied for override, and a 5V emergency power point on the underside lets you open the door with a power bank if the batteries die completely.