ROOP iPhone 6 / 6s Battery Case,Ultra Slim Extended Battery Case External Protective Battery Case Back Up Power Bank with 2500mAh Capacity, Lightning Charging Port, Earphone port (4.7" black) COMPACT DESIGN: ROOP case provides up to 100% extra battery life with a thickness of only 0.18 inch which equals the thincess of two 50 cents coin approximately. No bulky length at all which makes the case like an regular protective case. The 360 resilient bumper and hard-shell backplate provide the best shock absorption without any signal reduction. Full access to all ports and buttons CHARGE & SYNC: Charge your iPhone and battery case with the Apple Lightning cable simutaneously. No need to organize and carry multiple cables anymore. Sync iPhone without removing the battery case SWITCH BUTTON & INDICATORS : Click the switch button to check the battery level in the battery case, each LED indicates 20% of the battery. Press the switch button for 2 seconds to turn on and off the battery case 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 for 2 seconds to charge your iPhone 6/6s Plus