Wireless Security Alert System w/ Motion Sensor

This is a great device for anyone.. Elderly People that need to know when someone is coming. A concerned parent that needs to keep track of children. Or anyone just needing to be alerted that someone is coming. Basically, there are two parts to the Driveway Alert Alarm system.
The Transmitter contains a passive infrared(PIR)sensor, which detects the moving heat created by an automobile’s engine(or any other noticeably hot object moving at sufficient speed). It can send signal to the receiver. Once someone crosses the beam, the receiver chimes either in low or high mode.