AMA BT40 Ranch Energizer for Enclosures with 9/12Volt Power Supply, Maximum Fence Length 3/4Km, Charging Energy 0.4/0.6 Joule Volt: 9/12V Charging Current: 0.5J Maximum Discharge Current: 0.4J Maximum voltage: 9900V Voltage at 500OHMS: 3100V Current consumption: 45mA Maximum length with strong vegetation: 0.5km Maximum length with little vegetation: 1.5km Maximum length without vegetation: 3.5km AMA Code: Original code: 91910 AT