Keep track of vehicles entering or exiting your property with the Mighty Mule Driveway Alarm (FM231) When a vehicle passes the sensor, the indoor receiver emits an audible tone.  Additional indoor receivers can be placed in multiple areas (within range of the driveway sensor). Easy to Install and the stake is included in kit.

Installation Manual
Mighty Mule Warranty Information
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Electromagnetic technology detects vehicles entering and exiting driveway and alerts you with an indoor chime.
Up to 400ft range from indoor receiver to driveway sensor/transmitter.
Does not detect people or animals, eliminating false signals.
Transmitter requires 2 batteries (not included). Lithium alkaline AA batteries are recommended for extreme climates (hot or cold).
Ideal for monitoring parked boats, RVs, motorcycles, etc.
12 Month Warranty.