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User tips: 1. Slide the phone into the battery case. Make sure that the phone is well connected to the USB connecter of the battery case. Then you can start to use the phone. 2. Charging for the phone: just press the power button on the back of the battery case to start charging. And press the power button again to stop charging. 3. When you charge the battery case with the phone attached, the battery case will be charged. If you would like to charge the phone first, you have to turn on the power button on the back of the battery case. When the phone is fully charged, the battery case will be charged next. Our advantage: SAJI iPhone 7/8 Plus battery case can perfectly compatible with charge and data transfer.Product specificationCapacity: 4000mAh Li-Polymer rechargeable batteryOutput:5V/1A, Input:5V/1AFeatures:Ultra slim and lightweight designLED power indicator can let you know the level of the battery.Easy to installProvide more power to play more games, video, music.Attention: if you have use for a long time, have some disconnection problems, you can use some tools to clear the dust of the lightning port, then it will connect great.We provide 12-month quality warranty.