Duracell Duracell Du7170 4,000mah Powerbank (black) - Other Chargers - Retail Packaging - Black Trust The Power Within, With Duracell Rechargeable Power Pack 4000mAh of capacity. Charges all iPhone's Two to Three times, a Galaxy S3 Twice, or an iPad / iPad 2 once. Super-fast charge output (5V/2.1A) though USB port (5V/2.1A ) allow for charging of your iPad, iPhone, Android, and more at high speed. Recharges Rapidly Thru Any USB Port or Outlet