Program the YL-99 with up to 10 codes: 1 master code, 1 passage code, and 8 user codes that are 6 to 15 digits long. Assign any of the 8 user codes to your friends, family, and others you trust. To temporarily allow in and out access for guests during parties or get-togethers, use the passage code to activate passage mode. Guests need only press any button to unlock the TurboLock.