Never run out of power again with your own personal LONELY DOG battery. Just plug your device into the USB port on the top of this portable battery charger. With a recharge capacity of 5200 mAh, this charger will give you 1.5 full recharges of your smartphone or recharge your tablet to 50% capacity. When the battery charger runs out of power, just plug it into the wall using the supplied cable (included), and it will recharge itself for your next use.