The iPhone Battery Case by SaFPWR is the must have accessory for everyone that owns an iPhone. This revolutionary smart phone charger lets you use your wireless device free of its power limits. With the SaFPWR iPhone battery case, you can listen to music, surf the internet, e-mail, text and know that you will have the power to make or receive a phone call. The iPhone battery case serves as a rechargeable battery for iPhone 3G and 3GS to virtually eliminate your run time worries. You will no longer need to pack a charge cord or look for an electrical outlet when traveling. Nor do you need to limit your tweets, e-mails, texts or posts to save power. In fact, you can experience up to two days or more of run time with the battery life extender capabilities of the iPhone battery case.