SAM Series low interference, high efficiency modified sine wave DC-AC inverters convert 12 VDC to 115 VAC at an output frequency of 60 Hz. Connect through any 12V lighter socket in your car, boat, truck or RV, or use the battery clamps to connect directly to your battery. ETL safety listed. USB charging port: 5 VDC, 2.1A2 three prong outletCigar lighter plug and battery clamps includedLoad controlled cooling fanLow battery input alarmUniversal protection circuit: thermal, battery, overload, short circuit, earth fault