This backpack features a built-in, full-color high-resolution LCD screen (1360*800), functioning as a programmable sign for portable billboards, advertisements, holiday messages, slogans, and business promotions, you can play high-definition videos simply by connecting a USB drive. It's perfect for commuting, traveling, cycling, outdoor adventures, work, or even as a hiking backpack or a unique gift for friends. The backpack requires only a mobile power supply (not included) to display your design or video anytime, anywhere, making it highly portable.