The sounder I suggested earlier in this post will produce a Ding/Dong when you close a door mounted switch. By setting the dip switches on the back it will sound continuously or only 3 times upon contact closure no mater how long the door is open. You can get it from any alarm supply co. (ADI) Will mount in a 1 gang box. Just need a normally open mag switch on the door. I have one on my shop door.
