B80, power plus battery fence charger, 0.8 joules of stored low impedance power, powers up to 55 acres, 8 miles of multi-wire permanent fence, built in battery save feature to extend the life of your battery, easy to use 5 stage rotary dial to change energizer operating functions, uses 12v deep cycle rechargeable battery, e.g marine type, not included, ready to use with solar panels to conveniently charge the low battery, bar graph can be used to indicate battery capacity & output voltage.