TRAVELON DUAL USB CHARGER/ADAPTOR Built-in surge protection Protect your electronic devices! If you are plugging in a phone, computer, or camera these devices need surge protection! Don't fry your expensive electronic devices! Power up in over 150 countries. Includes 2 USB charging ports. Use with voltage converters, transformer and dual voltage appliances. Built-in surge protection. Rating to 800W/2.1 amp; charger works on 110V or 220V AC to charge mobile electronics. 2.25" x 2.25" x 1.75".