Master Lock 4400EURD Bluetooth Smart Padlock No key, no combination - your key is your smartphone! No more lost keys or forgotten combinations Thanks to Bluetooth Smart technology, your Master Lock padlock is connected to your smartphone via the free MASTER LOCK VAULT app This INDOOR USE padlock is an ideal solution to share/manage access to lockers, storage units, toolboxes, cellars/lofts and trunks Share the access to the padlock: add or remove access to one or different users, schedule the access (day/time) If you don't have your phone you can still open your lock using a directional combination (up/down/left/right)