Mighty Mule FM130 Wireless Vehicle Sensor for Automatic Gate OpenersWireless gate opening wand sensor for automatic gate openers. Sensor has 100 ft (30. 48 m) range. Allows for hands free exit from property by sensing "mass metal in motion" with an, up to 12 ft (3. 66 m) magnetic field, it enables cars, trucks, atvs, etc. Highlights: 100 feet range Opens gate to let vehicles exit property Compatible with all brands of automatic gate openers Ideal for solar application Low power consumption Easy installation, 2 piece