I took a black magic marker and coloured one and installed it on my screen door just for giggles so I could watch everyone freak out as they came into the house.I also put one on the top of the bathroom door where the shorter folks couldn't grab it. Nice way to make sure they're awake for school heheIt will do the job as intended for anyone who opens a door or window unexpectedly. HINT HINT Parents of teens, lol
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