Mobile power that stacks up - literally. Slimmer and stronger. At 0.47in, Anker"s Astro Slim3 comes with enough power for 3 or more charges to most smartphones in a compact, easy-to-grip case. Sized especially to stack behind your 4.7in smartphone for uninterrupted phone use while charging. An LED column unobtrusively lets you know just how much juice is left. Say goodbye to knots. Who doesn"t hate tangled cables? With an intuitively-sized micro USB cord for Android, the Slim3 allows you to carry your power all-in-one. Using an iPhone? Plug into the USB port and charge up via your OEM cable. Free yourself from cords and get back to what"s most important: life. No expense to speed. What"s better than a high-capacity battery that slides into your pocket on-the-go? One capable of simultaneous, full-speed charges. Both ports supply 1A of power with complete safety to your phones, so you can power up in no time and make the most of your day. For optimal use. • For simultaneous, max-speed charging of your Astro and other devices, check out Anker"s new 25W 5-port wall charger or dual-port 24W car charger. • Compatible with all Apple and Android smartphones, tablets and other 5V input USB-charged devices. The iPod nano, the Samsung Tab2, Asus tablets (not include the Nexus 7), the LG G2 and some GPS and Bluetooth devices are not supported. The built-in Micro-USB cord may not be able to work with thicker bumpers or cases. Get to know us. The Anker Astro external battery has been voted #1 in class by thousands of online reviewers, while our renowned customer service has made us a fan-favorite across the web. Every sale includes an 18-month, worry-free guarantee to prove the importance we set on quality. After all, we"re customers too.