iWALK Supreme Dual USB 5200mAh Rechargeable Battery Pack (Black)

Charge two USB devices simultaneously while on the go with the black Supreme Dual USB 5200mAh Rechargeable Battery Pack from iWALK. One USB port will charge your devices at 1A power, and the other will charge Apple products and other power-hungry devices at 2.1A. When using both ports simultaneously, however, the total output will be 1A for each port. Smart circuit protection prevents your devices from overcharging.