HEAVY DUTY – equipped with \'extra-power\' battery, perfect for starting bigger engines. Selected as a “Best Buy” by Which Caravan Magazine because of its feature packed specification. It is ideal for starting petrol engines up to 6 litre and diesels up to 4 litre. Included are 1m long leads for easier use, allowing you to safely connect the Jumpstart 4000 to your battery. The audible alarm will warn you if you have incorrectly attached the leads to avoid damage while the internal battery is maintenance free and has a low charge indicator. Product Awards: