Specifications Model ONS-300A ONS-300 Input Voltage Range DC10-15V DC10-15V Output Voltage Range AC100-120V AC210-230V Maximum Continuous Power 300W Surge Capacity 600W Output Frequency 60±2Hz 50±2Hz Output Waveform modified sine wave No Load Current Draw <0.3A Optimum Efficiency >90% Over Load Protect yes Over Voltage Shutdown yes Under Voltage Alarm yes Under Voltage Cutout yes Short Circuit Protect yes Over Temperature Shutdown yes Cooling Fan yes Operating temperature range 0°C to 40°C (32°F to 104°F) AC Receptacle US Socket×2 Dimensions ( L x W x H ) 　128×95×55mm Weight ( approx. ) 0.8Kg  Note: Specifications subject to change without notice