ROMOSS Solo2 4000mAh Portable External Power Bank Battery Charger Pack Recharger Power Supply Station with LED Torch Charging for iPhone iPad Samsung HTC Huawei Android Cell Phone and more Fast Charging and Efficient Output: fast charging of only 5 hours, power output conversion rate improved to 85% Charge while discharge: can be charged and discharge simultaneously, dormant when unused to avoid any power waste Compatible and Smart: automatically adjusts output based on the connected device, compatible with all popular smartphones and tablets Light and Portable: 1/2 size of iPhone with simple and elegant look, easy to hold and perfect for emergency use Emergency LED torch and LED indication for battery status