Duracell Rechargeable Portable USB Power Bank 4000 mAh for use with iPhone, iPad, iPod, BlackBerry, Samsung, LG, Motorola, Kindle, Nook (Purple) Duracell Rechargeable Portable USB Power Bank 4000 mAh for use with iPhone, iPad, iPod, BlackBerry, Samsung, LG, Motorola, Kindle, Nook (Purple)