Mighty Mule Direct-Burial Gate Opening Wand Fence SensorMighty Mule Driveway Vehicle Sensor The Mighty Mule Driveway Vehicle Sensor (FM138) is an essential accessory for automating your gate system. This direct burial sensor detects vehicles with a 12 ft. magnetic field, automatically opening your gate without the need for a remote. Perfect for residential and commercial properties alike, it makes entry and exit seamless while ensuring security. Key Features: Easy Operation: Automatically opens gates as