Keep track of vehicles entering or exiting your property with the Mighty Mule Driveway Alarm (FM131) When a vehicle passes the sensor, the receiver emits an audible tone. Easy to Install and stake is included in kit. The electromagnetic sensor will sense large metal objects and send a signal to the interior base station to let you know someone is there. HINT: Install the batteries, near the installation site so the sensor can ?learn? the area. If the batteries are installed in the home; the unit may not function properly. Click for Price @ HomeDepot.com
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