Room Display is an app that works perfect on a android tablet 7″/10″. It’s soul purpose is to be used on a mounted tablet up on a wall next to all conference rooms at the office. It then uses androids built in support for Exchange (or other calendars) to show whats happening in the room.
Focus on the meeting screen is to show your users if the current room is free, busy or pending. In this way you will have a good overview if you can use the room in the meantime or who has booked the room right now.