This is a new series of step-up/step-down transformers with a 5VUSB interface. You can convert the voltage from 110 volts to 220 volts, or from 220 volts to 110 volts. The maximum rated power of ST-5000 is 5000 watts. It is very suitable for household and industrial applications. Specifications: Input voltage: 110/220V//200V/210V AC selectable Output voltage: 110/220 V/AC, 5V/DC USB Dimension:30*22*15cm Weight: 12.5kg What's In The Box: 5000W voltage transformer.