Check the listing for details. Automatic Electric Lock for Mighty Mule & GTO Gate Openers. Condition: New. Listed at 79.95 USD. Electric Lock for GTO Mighty Mule Swing Gate Openers Operators Features:Compatible with FM350, FM500, FM502, MM560, MM600 ETC GTO Mighty Mule Models gate opener systemsElectric Lock unlocks and locks gates automatically as they open and closeRecommended for gates over 7 ft. longIdeal for animal enclosures or high wind areasBrand newProduct DetailsItem Weight: 4 poundsPackage Dimensions: 12.9 x 4.5 x 2.7 inchesItem model number: 12V Electric LockItem Package Quantity: 1Batteries Included?: NoBatteries Required?: NoShipping Weight: 4 pounds For added security. Unlocks and locks automatically as gates open and close. Recommended for gates over 7 ft. long. Ideal for animal enclosures or high wind areas. Compatible with any 12V gate opener systems.