The Anker® Advantage: Join the 6 million+ powered by Amazon's #1 charging brand. Exclusive PowerIQTM Technology: Detects your device to deliver its fastest possible charge speed up to 2.4 amps per port or 8 amps overall. Highest Power: World's highest output of 40 watts through five ports lets you charge any combination of phones, tablets or other USB-charged devices simultaneously. Guaranteed Safety: UL certified design, industry grade materials and premium circuitry ensure superior performance and reliability. 100-240 volt input ideal for international travel.