iPhone 6 Battery Case Works with Apple Lightning Cord, LACERTA PowerCell for iPhone 6 (4.7 Inches) 3500mAh External Battery Designer Case / Protective & Slim Custom Fit Case for All Versions of Apple's iPhone 6 4.7 Inch (Not the iPhone 6 Plus 5.5 Inch) Control & Power at the Touch of a Button - One-touch On/Off button with LED Power Indicators. The case has a button on the back of it that controls what gets charged when the case is plugged into the charging cord - either the iPhone is charged or the case is charged but not both without pressing the button to switch the charge. If the button is not pushed then the charge only goes to the iPhone or vice-versa. Never Get Stuck with a Dead Battery Again - Powerful 3500mAh Smart Li-polymer battery provides more than enough battery to get you through the day Sync-through technology - Charge your iPhone and the PowerCell Case with your existing Apple iPhone Lightning Cable with the PowerCell Case On Solid Protection in a Light Weight, Slim Design that Fits the iPhone 6 4.7 Inch Perfectly No Risk - Lacerta PowerCell Includes a One-Year Warranty and Guarantee - For Apple's iPhone 6 4.7 Inch - also called an iPhone 6 Power Case / iPhone 6 Juice Bank / iPhone 6 Battery Pack / iPhone 6 Charger Case - Comparable Cases Sell for $99.00++