The room is available
If the iPad display is green it means there is currently no meeting occurring in that room. Rooms will also calculate the amount of time the room will be free for, until the next scheduled meeting.
If you need the room, you can choose the duration you need the room for (15, 30, 45 or 60 minutes, or until the next meeting depending on where that falls), click "Book now" after selecting your duration. You can read more about the impromptu meetings feature here.
The room has an upcoming meeting
If the display is yellow that means that a meeting is scheduled to begin in the next 5 minutes. Meeting attendees will have the ability to check into their meeting and secure their room. Read more about check-in and room release here.
The room is in use
If the display is red that means a meeting is currently taking place in this room. By looking at the Schedule display, you can see how long it will be until the meeting ends, if there is another meeting after it, and the room's schedule for the rest of the day.
If your meeting ends early you can also release the room by hitting "End meeting". Read more about End meeting here.
Your Envoy Rooms iPad display will dim to ten percent brightness between the hours of 9pm and 7am, for the timezone set on your iPad.
To verify the timezone, on your iPad go to Settings > General > Date & Time and make sure "set automatically" is toggled on.