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Usage notes: if the rated power or start power of your electrical device reaches over 150 W, we suggest connecting the inverter with connection terminals to the car battery. Otherwise, your fuse would be burnt through to the socket. Please use BESTEK cigarette lighter cable to connect to your car battery. If the charging current of your device is less than 1 amp, we do not suggest connecting the charger directly to the USB port. Very important! The inverter is generally usable for cars, preferably please do not use on trucks. Other vehicles.It is normal that the inverter gets warm while you use it.Avoid placing the inverter in direct sunlight or next to heat-sensitive materials.Do not use high performance electrical appliances such as hairdryer, electric heaters, kettle, coffee machine, electric toothbrush (resistance capacity step-down), which could blow a fuse. Working temperature: -5 ~ 40 ° C. Box contents: 1x inverter 500 W 2x Car battery clips, 1x user manual (English language not guaranteed), 1x cigarette lighter plug, 2x external interchangeable fuses.