Product details of Pineng PN-999 Powerbank 20000mAh Large Capicity Dual USB Output Design with LED Display (Silver) + Free Pouch Bag Small and light weight. Portable， able to charge your devices anytime at anywhere. With led light indicator， showing the percentage of power remained. LED Flashlight function， which could be helpful in the dark. Adopt high-stable switch power to control circuit and intelligent single-chip power management scheme. High power conversion efficiency: the power conversion is as high as 90% or above， much higher than other similar products. Suitable for most smart phone and devices protection IC to prevent over charging， over discharging and short circuit. http://imgur.com/EBxkhhh Specification： 1. Input: DC 5V 1A 2. Output: 5V 1A，5V 2.1A ≥59wh 3. Built-in battery capacities: 3.7V/20000mAh 74wh 4. Battery Type: Lithium Battery 5. Charge retention: >5000hrs 6. Cycle life of charging: 500 times (1 time = from 0% to 100%) 7. Net Weight: 445g 8. Size: 162.5*79.6*22mm http://imgur.com/hs1cQzS Features: 1. Dual USB output. 2. Built in LED flashlight. 3. It take 14-16 hours to fully recharge when power bank battery 0%. 4. Compatible for any phone， tablet， MP3， MP4， PSP， GPS， game device， camera and many more (just connect with your USB cable). 5. LED display (display battery percentage， in / out charging status) 6. Intelligent voltage recognition chip automatically detects the voltage. 7. Built in battery protection IC to prevent over charging， over discharging and short circuit. http://imgur.com/cthpGde