Feature: 1. POWER SUPPLY: This LED backpack needs to be connected to a power source to be used, powered by USB 5V 2A mobile power. But please note that the power supply is not included in the product. 2. DIY PATTERN: You can modify the pattern at will through the cell phone APP, this LED motorcycle backpack has a 48x48 full color dot matrix screen, support text, pictures, GIF and other formats. 3. HARD SHELL AND BREATHABLE DESIGN: LED backpack appearance choose 3D waterproof material, adjustable size of shoulder straps. The back is made of breathable material. Stylish and cool design, easy to spot in the crowd. 4. EXPANDABLE STORAGE SPACE: The motorcycle riding backpack has an expandable space for a wide range of motorcycle helmets, full face helmets, off road helmets and more. 5. MULTIFUNCTIONAL: Hard shell travel bag has enough storage space. The large zipper pocket serves as a laptop bag, can hold tablet. Inside there are several independent small compartments for storing cosmetics, tissues, keys, textbooks, cell phones, umbrellas, some sports equipment and so on. Specification: Item Type: LED Backpack Material: ABS, PC Control: Smartphone APP Control Power Supply: USB 5V 2A Mobile Power Supply (Not Included) Support Picture Animation Size: 48x48 Pixels Program Support: Text, Image, GIF Animation Gross Weight: Approx. 2736g / 6.0lb. Package List: 1 x LED Backpack1 x Storage Bag 1 x User Manual