280 watt peak. Specifications: Maximum Continuous Output: 140W. Surge Capacity (0.1 second): 280W. Full Load Input Current: 14A. Optimum Efficiency: 85%. No Current Load draw: less than 0.2A. Output Frequency: 60HZ +/- 2%. Output Wave Form: modified sine wave. Output Voltage Range: 120VAC +/- 5%. Input Voltage Range: 10.5V-15.5V. Low Voltage Shut Off: 10.8V +/- 0.3V. Over Voltage Shutdown: 15.5 +/- 0.5V. AC Receptacle: NEMA 5-15 USA. USB Port: 5V. Features: 120V AC household outlets. 5V USP port. Overload protection. ETL listed. Made in China.