mophie Juice Pack - Power bank - 2300 mAh (Micro-USB Type B) - on cable: Micro-USB - red - for Samsung Galaxy S4

Key Features and Benefits:

• Power for any occasion
  When life gets busy, you need your phone to keep up. The juice pack made for Galaxy S4 provides enough charge to get you through any busy day at the office or night on the town. Flip the switch when you need a charge and forget about searching for a power outlet in the middle of your day.
• You're covered all day, everyday
  Its slim design makes it easy for the juice pack to become your everyday case while still providing complete protection from your busy lifestyle. A smooth finish and pass-through buttons flawlessly blend the design of the case with your Galaxy S4. To make sure you always head out with two fully charged batteries, charge your S4 and juice pack simultaneously with the included micro-USB cable.
• Added features for ease of use
  The juice pack was designed with ease of use in mind. A standby switch lets you charge your phone only when you need it. Recharge both devices simultaneously by connecting your juice pack and phone to any USB wall plug. Connect to a computer to charge, sync and download photos and other files. Four LED lights on the back let you keep tabs on how much power is left in the juice pack battery, and, when charging, will keep you updated on its status.