Professional booster pack designed for regular starting of petrol and diesel cars, camper vans, 4x4s vans, tractors, boats etc. Powerful 2500A peak, 1450A Cranking. 28Ah Spiral battery can also be used to charge portable devices such as, Laptops, cameras, lights etc. Use and then recharge, the unit charges automatically when attached to the mains and can be left permanently attached to the mains supply while not in use. Reverse polarity alarm. Clamps 600 A, Cable 25mm diameter, 1.3m long. Powerful LED light and internal battery tester.