An awesome combination of a high-density 2500mAh battery, an integrated Apple Lightning connector, and our Brainy Technology (for intelligent charging) in a business card-sized unit. PowerStack battery packs are so compact and light that you won’t even notice you are carrying them. Keep your iPhone 5s running for up to another eight hours of normal usage. PowerStack battery packs are Apple MFI-certified and compatible with a full range of iPhone 5, iPhone 5c, and iPhone 5s, iPhone 6, and iPhone 6 Plus models, as well as the fifth-generation iPod Touch and seventh-generation iPod Nano. Their retractable Apple Lightning connector makes charging your device a snap by eliminating the need to carry around an additional cable. With their unique “Stack ‘n’ Charge” technology, PowerStack battery packs can be recharged “cable-free” using the PowerStack charging pad. The pad can charge up to three PowerStack battery packs at the same time, reducing clutter in the office and home. For added convenience, PowerStack battery packs also feature a Micro USB port that allows charging using via a USB 2.0 cable. Ultra-sleek and ultra-stylish, PowerStack battery packs provide all the power you need for recharging your iPhone or iPad whenever and wherever you require it without a single cable in sight.