The B11 powers 20 acres / 4 miles and is very easy to transport and set up. It is an ideal Energizer to use for strip grazing and providing portable power for short term animal control. Suitable to fence horses and cattle in small paddocks or properties up to 20 acres of single wire portable fencing. The B11 has adjustable battery-save options to extend battery life and requires 6 x "D" Cell (1.5V) batteries (not included).