For Juice Pack Helium iPhone 5 / Juice Pack Air iPhone 4/4s LIFE-TECH 10W 2.1A Dual USB Ports Wall Home House AC Charger w/ USB Cable USB Cable design to charge Juice Pack Case only. Dual USB sockets allow you to charge 2 devices at once. Simply use a compatible usb cable for your device to get charge up from this charger IC Chip recognizes a full battery & automatically switches to saver mode. ,Input: AC100-240 Volts, Output: 5.0V ~ 2100mah