Kingsons KS3140 Men Women Laptop Backpack with USB Charge Multi-function Waterproof Business Leisure Travel School Bag Backpack

Size:Model A-13.3 inches(27cm*16cm*43.5cm)

Model A-15.6 inches(31cm*19cm*46cm)

Model A-17.3 inches (37cm*22cm*50cm)

Model B 15.6inches(30cm*13cm*46cm)

Note:the backpack is just with a removablequick chaging usb data cable,

there isno power bank (mobile battery)inside.

Note: There is no mobile powercomes with the backpack inside.

If you want touseExternal USB Charge Function, you have to do as follows:

1.Buy 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.

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 ofthefirst mobile power.