Size: KS3140W-13inches(27cm*16cm*43.5cm)

KS3140W-15inches(31cm*19cm*46cm/ 12.2"x7.4"x18.1")

KS3140W-17inches (37cm *22cm*50cm)

KS3144W-15inches(31cm*13cm*46cm/12.2"x5.1"x18.1")

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 ofthe first mobile power.