I figured this was the best place to ask.
I'm looking for a door sensor that will set off a flashing light rather then make noise.
I often work late nights in my shop with very loud power tools and doubled up hearing protection, I could not hear some one kicking in the door or a "ding dong" that you see at a 711 type of store. I want this not only for night time but also for the day. I can't set the alarm while I'm there as it will go off. I also can't change the alarm system due to my lease.
My shop is located in a industrail area, miles between me and the nearest house and most biz close at 5.