STANLEY 300 AMP / 600 Peak AMP Power Station with USB Charger 300 instant starting amps to restart a wide range of vehicles Built-in high efficiency charger, thick cables and metal clamps to assure better power transfer and a longer lifetime of the unit Visual and audible reverse polarity alarms to warn you if youve connected the cables backwards 12 Volt DC power outlet to power cell phones and other personal electronics while on the road or in an emergency Battery status indicator lights display the units level of charge when the status button is pressed or while charging Small, easy to carry and light weight Recharge with the built-in AC charger and a household extension cord Bonus dual USB charger plugs directly into the jump starter or vehicle DC port to charge 2 USB devices simultaneously including smart phones and tablets