Aluratek's 20,000 mAh Portable Battery Charger with Qualcomm Quick Charge 3.0 utilizes the latest in lithium-ion rechargeable battery technology offering a superior power capacity to quickly recharge your portable USB devices 4x faster than regular battery chargers*. Small enough to fit in your backpack or laptop bag, this portable battery charger is perfect for on-the-go charging when you don't have the convenience of an AC outlet nearby. With dual USB ports, you can charge two devices simultaneously including smartphones, tablets and other USB powered devices. Includes LED charge status indicators so know how much battery power is remaining. Recharges in 8 hours..