Koler Battery Case for iPhone 6 6s Ultra Slim Extended Charging Case External Battery Case Portable Charger for iPhone 4.7 inch with 2400mAh Incredibly Slim : Koler battery case more than doubles your iPhone's battery life without doubling its size (adds only 0.16in & 2.47oz). Deluxe matte exterior provides secure grip and protection Featuring SYNC-THRU and LIGHT-SYNC technology : No extra Micro USB cable. The iphone 6 charging case allows you to sync iPhone to a computer without having to take the juice pack off.(charged & synced concurrently)Simultaneously charge your iPhone and battery case together with original iphone 6 Apple's lightning cable . When charging, the phone will be full charged first Easy To Use : Use your iPhone as your normally would. When your iPhone's battery is low or you need to charge your iPhone, just press and hold the power button on the case. Your iPhone will then start charging. 4 LED indicators on the back of the battery case to indicate how much juice is available to your iPhone Longer Battery Life : Built-in 2400 mAh capacity effectively provides an extra 11 hours 3G talktime, 9 hours HD video play , 9 hours web browsing or 7 hours gaming to your iPhone 6 .Easily insert your iPhone 6 into the original Apple's lightning output port .It is only 40 minutes , the iPhone 6 can be recharged from 0 to 76% Updated Version : The extended battery case is made of durable material which helps protect against scratches, fingerprints, smudges and the wear and tear of a life on the go all without interfering with your signal