REDGO Protective Charging Battery Pack Case, 3500mah Battery Charger Case Power Bank, External Battery Power Bank for iPhone 6 6s (Blue) 2 in 1 function.Charging and protecting.Built-in short circuit and overcharge protection. Integrated power switch allows you to turn on/off the battery case quickly. Featuring sync-through technology that you can sync your iPhone to a computer without having to take the battery case off. Stream-lined design with accurate cut-outs. It's perfect for traveling and outdoor activities. You can also easily access to the buttons and ports of the phone without removing the battery case through the cut-outs. Made of high quality material, unique and comfortable tactile impression. Protects the phone from bumps, scratches and dust. Built-in 3500mAh lithium polymer battery, high efficiency and high conversion rate. Adds 200% battery life. Ideal for long distance journey and business trip.