This lightweight and sturdy backbag is designed for optimal on-the-go use. With a LED display screen, you can customize an advertiment or a cool slogan on the screen, then you will definitely be the most outstanding one in the crowd. Features: With a LED display screen, support image, text, anime display. Control by WIFI APP, you can customize the content as you like. Ergonomic design of padded shoulder straps and back, comfortable to use. Made from high elastic and breathable sponge and fabric, with adjustable buckle. Perfect for outdoor advertising, travelling, sports and as a display to show your personality. Specifications: Color: Grey / Pink / Cyan / Yellow. Rated voltage: DC5V. Material: Nylon+ Polyester Cloth. Program support: Text, Picture, Animation. Communication Method: GPRS WIFI. Pixel: 64 * 64. Support points: 64 * 64 full color dot matrix screen. Power supply mode: Charging Treasure. LED color screen size: 25 * 25cm. Item size: 44*35*13cm. Weight: 870g. Package List: 1 * Backbag (No battery included) ?