RINGO is a solution that allows your guests to access their booked vacation accommodation via their mobile phone. Accommodation managers can easily unlock the door for guests, cleaners, relocation service ... or allow them to enter by them selves for a limited time only. Guests do not need a key or an app, just their smartphone. RINGO allows you to unlock more doors, you can open the apartment door and at the same time unlocking the communal doors (multi-dwelling buildings).