... digital products with USB port.2,Please connect in right turns during use: first connect inverter to car, then ... temperature: -15°C-50°CWarning:1,Don't use the device when engine is off or the battery ... will die out.2,Don't use the device overload, for keeping good performance of ... than 80% rated power of inverter.3,Please use the device in ventilated condition, and don't block the ...