PowerXology Sense 6 Plus 20000mAh Power Bank Fast Charging Dual USB Port external battery portable phone charger for iPhone 6 iPad Phone tablets Fast Charging: fast self-charging IC technology saves half time to fuel up the power bank, high energy conversion rate ensuring 10 full charges on iPhone 5s Dual-USB Port: charges two mobile devices at the same time and can be charged and discharge simultaneously, never out of power any more Battery Display Screen: battery percentage indicator on the front shows current power levels within 1%, dormant when unused with no power wasted and helping you remember to charge Compatible and Smart: built-in smart chip automatically adjusts output current based on the connected device, compatible with all popular cell phones and tablets Compact and Enduring: matte finish, dust-proof and fire-retardant shell with simple and elegant look in portable size