410w, 820 peak power converter, for mobile entertainments & electronics, converts vehicle power to 120vac household power, compatible with all smartphones, tablets & sub devices, 2a sub port, 2 times faster, on/off switch, led indicators, surge protection, protects against damaging current fluctuations, thermal protection, shuts down if operating temperature is too high, built-in, high speed cooling fan, low battery alarm, easy to use, plugs into vehicle’s accessory outlet or connects directly to battery with clamps, contents 1 schumacher xi41b, 1 clamp adapter, 1 dc adapter, 2 replacement fuses & owner’s manual.