Optimal Use / Precautions: 1.Always make sure that the total rated power of the connected devices is 200W. 2.Avoid placing the inverter in a location that receives prolonged direct sunlight or near to heat sensitive materials as the inverter can become warm during use. 3.Converts DC power in your 12V batteries in your car,truck,boat or any other DC power sources into the AC power that electronics and tools need. 4.If the rated input of any connected AC devices exceed 150W use the larger power inverter as most vehicles 12V ports are rated and fused for 150W. Features: Ultimate Versatility It can be used for camping,outdoors,vacations,road trips,remote job sites.For maximum utility,stay in charge at all times and add this to your travel emergency kit. Replaceable Fuse The cigarette lighter built-in replaceable 20A fuse to protect your devices,easy to replace.Provides safe charging under harsh surrondings and all seasons. Cooling Fan Cooling fan is to keep the unit from overheating.And the fan speed depends on inverter temperature,the higher the temperature, the faster the speed.The conversion efficiency will rise after the cooling fan kicks on. Specifications: Rated Power: 150W-200W Peak Power: 300W Input Voltage: 12V DC US Socket Output Voltage: AC 110V~120V USB Port Output: DC 5V, 2.4A Inverter Efficiency: Up to 90.5% Weight:0.86lb Package: 1 x User Manual 1 x Cigarette Lighter Plug 1 x Vehicle Power Inverter