P20 - Great value amongst Patura 9 volt dry-cell battery energisers. Ideal for small cattle and horse pastures. User-friendly switch. Single indicator light.P40 - The all-round Patura energiser for 9 volt dry-cell batteries. Ideal for cattle and horse pastures with little vegetation. Battery test, slow pulse sequence, night save mode, half/full power.P60 - Our most powerful energiser using 9 volt dry-cell batteries. High performance for effective animal control even under load conditions at the fence. Battery test, slow mode, night save mode, half/full power.