Tablet & phone compatibility? Universal max-speed charging? Power-packed & portable? The reinvented Astro Pro2 has it all.PowerIQ™: Compatibility maximized.Not all charging ports are created equal. Standard ports only charge Apple OR Android devices at full speed. But with PowerIQ technology, each port intelligently identifies your device and seeks to maximize its charging speed (Max speed of 4.5 Amps among 4 ports).Uber powerful.20000mAh of power keep you and your gear going, and going – and going. Add 1000% more battery life to an iPhone, 600% to your large-capacity phone (like a Galaxy S4), or 130-300% to your tablet (depending on its battery capacity) – all away from an outlet. What’s more, the added energy efficiency gives you 10% more usable power than the previous generation and many standard alternatives.Brilliant display.Interacting with the all-new aluminum-cased beauty couldn’t be easier. The LCD simplifies everything – displaying the remaining power (with precision down to the percent), output, input and voltage selection.Broad Compatibility.Phones: iPhone, Galaxy, Nexus, One, Droid Razr, Lumia and more.Tablets: iPad, Galaxy, Nexus, and more.(List not exhaustive, compatible with ALL phones, tablets and other USB, 9V and 12V powered devices.)Usage note.• In order to prevent the battery from malfunctioning, avoid discharging the battery to 0% through the multi-voltage port, and be sure to first select the desired voltage output before using the multi-voltage port. • To ensure complete safety and best performance, we strongly recommend using your device’s original cable, a third-party certified cable (such as MFI) or our included cable.