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Vproof 5500mAh Battery Case for iPhone 6/6S/6/7/8, Making Your Life More Smart. Advanced Features: - Lightning Sync When data sync, no need to remove your iPhone from the battery case. This case has data transmission function and the same speed as iPhone original interface. - Extend Battery Life This battery case more than doubles your iPhone's battery life without doubling its size. The concern of cell phone running out of power will not be occurred when outside. Specifications: Battery type: Lithium-polymer Capacity: 5500 mAh Input Voltage: DC5V/2.0A Output Voltage: DC5V/1.0A Dimensions: 143*70.5*17.5mm Box Content: 1 x Battery Case for iPhone 6/6S/7/8 1 x User Manual Warnings For Optimal & Safe Usage: 1.Batteries are sensitive and should not be left in the sun. 2.You had better use your original stock cable or a third-party-certified lightning cable to charge the battery case. 3.Please do not wiggle the lightning port when you plug or unplug the cable.