Item Features: 1. Built-in 20000mAh high capacity rechargeable Li-Ion battery. 2. 12000mAh capability， powerful with long operation time. 3. High efficiency of power conversion，Aluminum alloy metal shell 4. External battery pack backup battery charger power station for digital products 5. Works with most MP3 players， PDA， MID， tablet PC cell phones as iphone4，IPhone 4S，IPhone 5，IPhone 5S， Samsung i9300，N7100.etc and USB powered devices 6. Ideal for extended calling， long trips， gaming and listening to music. Specifications: 1. Cell type: 18650 Lithium-ion battery 2. Capacity: 20000mAh 3. Input: DC5V 1.0A (Max) 4. Output 1: DC5V 1.0A (Max) 5. Output 2: DC5V 2.1A (Max) 6. Product Size:110*71*22 mm 7. Net weight: 278G 8. The portable backup battery pack is with a LCD display screen that is showing the quantity of electricity， and with a LED torch for daily lighting Notice:Color: Silver: silver， black， gold， black， blue (Please inform us which color do you need or we will send you random color)Standard Accessories :1 x 20000mAh Power Bank1 x USB Charger Cable 8 x Adapters1 x Retail Box