ER451S Output voltage: 220VAC 50Hz with 2Hz more or less and USB 5V. Output waveform: corrected sine wave. Input voltage: 12VDC. Audio alarm warns of low battery level prior to auto shut down. Safely shuts down if over temperature or overload condition. Operate home or office electrical products from a vehicle or a boat. Supply 200 watts of AC power from a 12-volt outlet or battery.   Package Details Weight: 418.37 g Size: 23.3*17.3*6.3 cm Package Includes 1 × DY8103 200Watts Car Power Inverter DC/AC+USB 1 × User Manual