The 900 Amp battery jumper and air compressor is perfect for use around the house, in the car, or in an emergency. The multi-function unit comes with a 260 PSI air compressor, 900 Amp cranking power jump, 1 DC outlet, and a built-in work light.NOTE: We recommend charging the battery for 40-48 hours before initial use. After the initial charge, charge the unit for 38 hours and/or every two to three months.Features and Specifications: Portable and rechargeable power source 260 PSI air compressor 900 Amp cranking power jump 1 DC outlet with 12V output Built-in LED work light Maintenance free high grade Sealed Lead Acid battery (18 Amp/hr) DC input charging source (w/included cables) Fuse type: 40 Amps external Charging time: AC: About 38 hours DC: About 12 hours Overload and short circuit protection Includes AC adapter, DC cigarette adapter, air compressor accessories Dimensions: 11 x 8.5 x 10 inches (27.9 x 21.6 x 25.4 cm.) Weight: 16.5 lbs. (7.48 kg.) Click here to view instruction manual