Smart LED Pixel Backpack with LED Lighting for Advertising, Waterproof Backpack, Outdoor Climbing Backpack, Bulletin Board, LED Screen, School Bags Walking Advertisement Screen on Your Back Promotional Backpack for Gifts Backpack Color: Black/Blue/Pink Bag Size: 44*34*16 LED Screen Size: 25*25 cm Pixels: 64*64 Points Pixel Grade: YY LED Color: Full Color Display Function: Text, Patterns, Animations, DIY Graffiti, Images Connections: Bluetooth, App for Programming You can write any words you want and send them to the backpack to display them, you can also upload your own pictures or gifs and show them on the LED backpack, you can even upload images from your album and send them for display on the backpack, or simply take a picture and then display it on the backpack. A stylish, fun, and cool backpack. With an inner opening pocket, you can place your laptop inside. Power Supply: 5V USB cable, you can use your power bank to supply power to it If you use a power bank with mAh, the LED screen can work for 5 to 10 hours; If you use a power bank with mAh for power supply, the LED screen can work for 10 to 20 hours. Note: We do not provide the power bank required 270