Run longer with your iPhone 4 with the SaFPWR Milano for iPhone 4. The Milano is the longest running smart battery case in its class for iPhone 4 and extends the life of your iPhone’s internal battery with its built in patented Energy Management Technology (EMT). SaFPWR is Superior to any other battery in the market because of its patented advanced Energy Management Technology.Milano is a stylish, protective case that more than doubles the time you can use your iPhone 4. With Milano for iPhone 4, you protect the inside and outside of your iPhone 4, keep your iPhone 4 charged while on the go, and enjoy up to 62 hours of extra audio and 15 hours of extra video playback, in addition to your iPhone battery. Milano fits the iPhone 4 for both the AT&T and Verizon networks.Milano adds less than ¼ of an inch in total width to your iPhone 4 and weighs less than 3.2 ounces. You can access all your iPhone 4 functions while it is in the battery case. For further ease of use, you can charge Milano and your iPhone simultaneously through the included micro USB cable. You can also sync your iPhone to iTunes while it is in the case with the included cable. Milano has passed the strict performance tests by an Apple designated test lab. As a result, the Milano has been officially certified by Apple Inc. as a "Works with iPhone 4" product. The Milano also uses an Apple-designated connector, which can only be ordered through Apple's certified vendors. This ensures that it's 100% compatible with your iPhone 4 whether you are on the AT&T or Verizon mobile network.