Cheap wireless tag motion sensor that will email or notify an app on ya smartphone when tripped, also can be used to attach to items you keep loosing like ya car keys and help ya find them..
Think I'll get a couple just to attach the wife's push bike, house, garage and garden shed doors.
http://www.wired.com/gadgetlab/2012/08/wireless-sensor-tags-help-you-keep-track-of-your-stuff/
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