Durable Fabric：Outer: High quality nylon composite waterproof fabric (Abrasion-resistant). Internal: Polyester Smart LED Backpack: Unleash your creativity with LED Space app. We have updated the APP to V2.0.0 version in May and improved many functions!! It is more easier to use.The backpacks can display texts images animations doodle How to use: LED screen is powered by external power bank (Not included). Connect your power bank with the internal USB charging port. Connect the WI-FI and use app for iOS and Android Design: Adjustable shoulder straps with mesh fabric for superior back ventilation and support.  Exterior Dimension Space: 17.3 X 13.5 X 5 inches. The backpack can fit up to a 15.6" laptop Package included:  1 Backpack (with a product manual) Exterior Dimension :17.3 X 13.5 X 5 inches  Screen Dimension: 9.8 X 9.8 5 inches (6464 LED dot matrix display)  Weight: 1.9 lb   Capacity: 20L  Text language supported by the 2.0.0 version of the App: English French Spanish Simplified Chinese Traditional Chinese Italian Latin Japanese German Portuguese Russian Novel Smart LED Backpack is a cool urban backpack which can be customized through an app.  It will be a awesome gift for your family or friends. How to use:  Download LED Space app from Google Play Store or App Store. Connect your power bank with the internal USB  port (Inside the backpack). Connect the YS+ device number WIFI hotspots. Password：12345678. After successful connection open the LED Space app to customize your digital art. You could add subtitles gif animations images through the app and will be displayed on the LED screen. Or use it for advertising. The backpack is compatible with any more than 2A-output mobile power supply. A 10000 mAh mobile power bank lasts about 6 hours for the backpack. More infos pls check the product manual.