"20000MAH" DUAL USB OUTPUT ALUMINUM POWER BANK EXTERNAL BATTERY PACK FOR IPHONE / IPAD / SAMSUNG (5V 1A/2A OUTPUT).The power bank with durable aluminum shell is a high-power and high-capacity emergency charger, with built-in 20000mAh high-capacity lithium polymer rechargeable battery. It can be recharged anywhere for you mobile devices, including MP3, MP4, iPhone 4, iPhone 5, Samsung Galaxy and other mobile devices.