Safety Technology Wireless Alert Series STI-34151 Wireless Driveway Monitor - Battery (sensor only)
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This additional sensor can be added to any of the Safety Technology Alert series sets as an additional sensor on the 4 channel receiver (up to four sensors total). With the purchase of an 8 channel receiver you can add up to 8 different sensors. This Sensor for Battery Wireless Driveway Monitor uses a patented magnetometer sensor system. Movement of any large metallic (iron or steel) object having a magnetic field will cause the sensor to transmit to the receiver.
Under ideal conditions, the sensor works up to 1000 feet (line of sight) away from the receiver in your home. For best performance, place the sensor within 500 feet of the receiver.
Dont see what you need? Want to build a kit? See: Safety Technology Alert Series-Build Your Own Kit