ROMOSS Solo2 4000mAh Portable Charger External Battery Pack Power bank Power Supply Station for iPhone iPad Samsung HTC Motorola Nokia Nexus android cell phone and more Fast Charging And Efficient Output: fast self-charging of only 6.5 hours, power output conversion rate improved to 85% ensuring 5 full charges on iPhone 8 Dual USB and Charge while Discharge: charge 2 mobile devices at the same time and can be charged and discharge simultaneously Compatible and Smart: automatically adjusts output based on the connected device, compatible with all popular smartphones and tablets Compact and Enduring: simple and elegant look with portable size, dormant when unused to avoid any power waste LED indication for battery status