Charge your smartphone and tablet on-the-go with the Macally Dual USB Power Bank. The 13,000mAh battery is capable of providing a full, fast charge to two devices at once, and is strong enough to support all-day use on either device. Featuring an easy-to-read battery level indicator and auto shut off—to preserve battery life when not in use—it is a must-have for users who travel with their smartphones, tablets, and other portable devices.