This powerbank packs a punch! With 20,000mAh you can charge your smartphone up to 10 times. The dual USB ports allows you to charge two devices at once. One port has an output of 2A which allows you to charge larger devices like tablets while the other port is ideal for smartphones. The sleak and stylish design is slim enough to fit into any bag or even your pocket. With a built-in flashlight, you can use it when light is needed. So buy this and Save 38.04$ Off on 20000mah Double Portable External Battery Charger for Smartphones for $11.95 with free shipping at Rakuten.com.