The water resistant flap on the front side of Ubidium is used to protect the port compartment from water, dirt and dust. 

The flap is designed so that it cannot be left in an open state and will close under it's own weight. Two additional magnets in the bottom corners keep the flap closed and provide additional closing power when cables are exiting the compartment. 

The lower edge of the flap is protected by a brush through which cables can easily fit whilst still keeping out unwanted intrusion. 

A drainage channel runs along the back edge of the compartment allowing water to drain to the left and right of the compartment. This is further sealed with a foam pad along the back edge of the lid. 

Additionally the flap protects the ventilation grilles for the internal ventilation system. The right grille (inlet) contains a filter which can be removed for cleaning / servicing.