We are building a pool that will be fenced on three sides and will be accessible from the house. There are three doors that lead into the pool area and we want to put sensors on the doors that sound a chime or alarm whenever these doors are opened. I would like them to be easily disabled fo times when there will be people constantly opening these doors and the pool area is physically monitored such as parties. I'd also like the sensors to be as physically unobtrusive as possible. Any recommendations?