The Mophie Juice Pack Air for iPhone 5 and 5S provides up to 100% extra battery life with the flip of a switch. Turn on the case when your battery runs low to stay fully charged whenever and wherever you are. The case features a refined outer band and smooth finish defending from every day wear and tear. Integrated, pass through buttons and a proprietary mute switch seamlessly blend the design of the case with the iPhone. Powerful 1700mAh protective battery case made for iPhone 55S allows you to utilize your phone's features long after the regular battery runs out while also providing protection for the phone. Smart battery technology provides up to an additional 8 hours talk time, 8 hours internet browsing, 40 hours audio playback and 10 hours video playback. Recharge both devices together with the included micro USB cable to make sure you always head out with two fully charged batteries. Easily access all controls and still get the speaker sound you're used to. It also has acoustic sound enhancing speaker ports for a richer, fuller sound quality. Four LED indicators on the bottom indicate how much power is left in the juice pack air battery.