Welaso Backpack Colorful Programmable Waterproof Review

【Suitable Scenarios】: This backpack has a built-in Bluetooth full-color LED screen. It is a programmable sign for portable billboards, advertisements, holiday wishes, slogans, and business promotions. Suitable for commuting, traveling, cycling, outdoor adventure, work, school bag, hiking backpack,or even surprise gifts for friends. 【Easy to Use】 3 steps: Plug in the power bank --〉Pair the Backpack to your smartphone device by Bluetooth connection--〉Use the APP to control displayed images, animations or text right on your Backpack. It's so easy!. 【Highlight Features】: 64*64 High brighten dot matrix screen,supports text, pictures and animations display. Large capacity,Double layer independent,Water Resistant, Zipper Closure,Trolley Box Nesting, Anti-theft, Durable Polyester nylon material,Mesh back, High Elastic Pad design. 【Space &Size】:Backpack size:16.9 x 11.9 x 7.1 Inches,large capacity(25L volume) with double layer storage,and there are many compartments in each layer,easy to store like water bottle,book,file,wallet,pens, phone, tablet, power bank, and 15.6 inches laptop etc. 【Customer Service】: Don't worry about after-sales service, if you have any issues or need technical support ,please feel free to contact us. as we will continue to update and improve the App to make it more interesting and multi-functional,pls remember to update your App and LED board program to the latest version