[Cobra #3170]

I built a device last year that works with a throw away type cell phone, it uses infrared motion detection and switch triggering to activate. It calls me on my cell phone and then I can either respond with .460 S&W in hand or call the police or both. I find that I sleep much better when my beloved Cobra is in the Hotel parking lot in it's trailer waiting to call me if disturbed. The unit uses a PIC
micro processor and infrared motion sensor. Throw-away phone service is about $7 a month. Total parts cost retail was about $20, I tried to get several manufacturing companies interested but nobody thought it was marketable.