Motion Detector Telephone Alarm

For $79, this might be useful for all sorts of fun projects – “The Telespy Motion Detector Telephone Alarm, a standard telephone features a built-in PIR motion sensor. If an intruder is detected within a 30 ft. range, TeleSpy calls a preset telephone number and allows you to listen in to the premises. Great for protection of homes, businesses, vacation homes and warehouses.” [via] Link.