Specifications:

switchBACK surge g4 - Backup battery case with kickstand for iPhone 4S and 4 (Verizon Sprint and AT&T) provides an innovative solution to the dreaded 'low battery' warning. Keep your iPhone 4 charged and protected with this combination backup battery and kickstand case. The integrated micro USB port even allows you to charge and sync your iPhone 4 while in use and give you a Standby time of Up to 275 hours. Blue LED lights let you know just how much battery life is left on your backup battery. Two interchangeable polycarbonate backs are included to allow you to customize the appearance of your iPhone. Integrated micro USB port allows you to charge and sync while in use.