The Drive-Thru Gate is energized with any common electric, battery, solar fencer or electric fence. The fiberglass polyethylene arms support the electrical yellow coated streamers that hang down giving a harmless shock when the animal touches them. Spring loaded gate swings closed automatically. Protects the finish on farm vehicles, as the metal never touches the vehicle. Arms break away if it should come caught on a tractor or vehicle. Will fit opening from 18 to 24 feet. Easy to install.