The lights in the meeting room will turn on automatically 2 minutes before your meeting is scheduled to start. The lights will turn off automatically 2 minutes after your meeting is scheduled to end. There are motion sensors in the meeting room which means that if you are inside and do not have a valid booking an alarm will sound.
Do not risk embarrassing yourself in front of your client. Make sure that you book the meeting room for as long as is necessary. Take into account that your client may arrive late and that your meeting may over run. Complaints for the lights turning off and the alarm sounding while you are still inside will not be entertained.