BESTEK 300W Pure Sine Wave Power Inverter Modified Sine Waves (MSW) are not smooth, flowing waves. Instead, they present a wave form that has steep crests followed by a sharp plateau and then a steep trough; that is why MSWs are also known as 'Square Waves'. On the other hand, the Pure Sine Wave is a smooth, more constant and flowing wave form. Therefore devices will run smoother, cooler, quieter, and will not be damaged from a MSW's sharp on/off fluctuations. Wide Application: Occupying a small iPhone-sized space, easily fits under the seat, in a center console, glovebox, or in your vehicle's trunk. It's ideal for today's compact cars or where space is limited, like on a motorcycle or boat. Pure Sine Wave Inverters provide safe and constant power supply for larger appliances such as: computers, laptops, TV, mini fridge, PSP, etc. 4.8A dual Smart USB ports charges all your mobile devices: iPhone, Tablet, wearable, iPad, camera, GoPro, smartphone, FRS Radio, GPS, etc. Product Specification : Power (2 AC Outlets): 300W Rated, 360W Max, 700W Peak Input Voltage: 12V DC, Output voltage: 220V~240V Dual USB Port Output: DC 5V, 4.2A rated, 4.8A Max. Auto 0~2.4A*2 Indicator: Green-operation, Red-shutdown Over Voltage Shutdown: DC 15V-16V, Low Voltage Shutdown: DC 10V-11V Optimal Use and Precautions: For DC12V ONLY, not applied for DC 24V and airplane use. Please do not leave the Power inverter in the ON position while your car is off. If the rated input of any connected AC devices exceed 150W, please use battery clamps to directly connect to your vehicle's battery as most vehicles 12V ports are rated and fused for 150W. Caution! Not designed for high power electric devices such as hair dryers, electric heaters, curling irons, etc. Package List : 1 x 300W Power Inverter 1 x User Manual