Newest 4.0 type waterproof LED Advertising backpack The backpack not include power bank Free a instructions book. 1.Color: Black 2.Material: Nylon 3.Pixel: 64*64dot 4.Capacity: 20-35L 5.Screen: LED Screen size: 25*25cm 6.Support points: 64*64 full color dot matrix screen Supply 7.voltage: 5V Power supply 8.mode: charging treasure power supply Communication 9.method: BLUETH GPRS Program Support: Text Image Animation 10.Product size: 44*34*16cm Product Properties:neon sign,backpack,hologram,neon signs LED Backpack: High-quality Laptop Backpack with LED Full-Color Screen can dynamically display your favorite text pictures and animations. Easy to use: 1.Plug the backpack into a power bank;2.Mobile download APP;3.Connect WIFI.Every backpack has a manual, don't worry about not using it. Colorful Text and Graffiti: Enter the words you want to say and creative graffiti in the APP to play on the backpack,You can advertise or show love. Pictures and Animations: Uploading pictures in the app is as easy as sending an emoji on whatsapp. It can dynamically display GIF. High-Quality Laptop Backpack: 15.5 inch Laptop Backpack Waterproof High capacity can meet the needs of daily work and study. 100% Risk-free Purchase: Full Money Back or Replacement for any dissatisfaction and easy-to-reach support.