Crelander LED Display Backpack:

This Backpack Has a built-in Bluetooth Full-color 25*25cm LED screen.

Power by power bank

pair the Backpack to your smartphone device by Bluetooth connection

use the APP to control displayed images,animations,text,video right on your Backpack.
Mobile phone APP control.

It has various functions such as Graffiti, Small games,Riding,Projection,Rhythm mode ect.