Anker PowerPort 4 40W 4-port USB charging hub for phones, tablets & more Media's Choice Recommended by the Wall Street Journal, which remarked that "PowerPort 4 was a godsend." Advanced Charging TechnologyExclusive to Anker, PowerIQ and VoltageBoost combine to ensure the fastest possible charge, whatever device you have. (Does not support Qualcomm Quick Charge). Ultra Powerful4 ports pump out 40 watts of power, enabling multi-device charging. Simultaneously charge two iPads and two iPhones at full speed! MultiProtect Safety SystemSurge protection, temperature control and more advanced safety features keep you and your devices safe. Super CompactAs small and light as a MacBook Air power adapter, the Anker PowerPort 4 is one of the most compact multi-port USB chargers on the market.Rated DOE Level 6 for energy efficiency.Awarded the US Department of Energy's highest possible energy efficiency rating (DOE 6).World Famous WarrantyAt Anker, we believe in our products. That's why we back them all with an 18-month warranty and provide friendly, easy-to-reach support.For Optimal Use:Use your original cable or a third-party certified one (such as MFi).Compatible with Apple and Android smartphones, tablets (including the Nexus 7) and other USB-charged devices.Note:If a port isn't working properly, your device may have triggered the protective internal safety switch. In order to reset the switch, unplug all cables for five minutes and retry. This charger is not compatible with the iPod nano, iPod Classic, iPod Shuffle, HP TouchPad and Asus tablets. We recommend charging your MacBook while it's turned off or in sleep mode (5-hour recharge time).