300W Pure Sine Wave Power Inverter 600W Peak 12V DC to 110V AC w/USB Inside transformer with high quality ferrite core, which takes high efficiency to our inverters. 300 watt continuous pure sine wave inverter 12 volt input, 110V 60hz AC output. 600 watt surge. World-brand key components (MOSFET, IGBT etc.) ensure the units working stable. Specialized PCB design, reasonable product configuration makes the units with less electro magnetic interference and more reliability. Over voltage, under voltage and overload protections. Good loading ability by special micro-processor design. Load controlled cooling fan saves power consumption. Low noise, high efficiency.