You want a Do-It-Yourself way of installing a home alarm? Hereâ€
The TeleSpy Intrusion Detector features a slim line standard telephone that plugs into a standard RJ-11 phone jack. It has a built-in passive infrared motion sensor, a 45 degree wedge, and an amplified condenser microphone. The TeleSpy Intrusion Detector also features a 30 seconds listening and after 30 seconds, the TeleSpy call disconnects and re-arms.
– $59.99 at thinkgeek