Note:There is no mobile power?comes with the backpack inside.
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If you want to?use?External USB Charge Function，you have to do as follows:
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1.B uy a mobile power?
2.Connect your mobile power with the USB interface inside the backpack ?
3.Connect your phone with the USB interface outside the backpack
4.Charging begins.
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There are 2 kinds of mobile power in the market.
1:Plug in your phone， you can start charging
2:Plug in your phone also need to press button of mobile power then start charging
To cope with this backpack， we suggest purchase of the first mobile power.
