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wire a set of car hons up to a car battery and put a car interior light swith on the inside frame of the garage. So when the door is opened the horns go off (ive got air horns on mine) you will also need to put a hidden swith on the door so you can disarm it (ive used a small push button and hid it under the door so you cant see it but u can still tutch it). The battery lasts ages i charge mine up every 3 months