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The backpack is a walking expression billboard. This LED dynamic backpack is cool trendy and fashionable. Communicate with the backpack through the scan code link, you can freely edit and send various patterns, texts, animations, change expression images anytime and anywhere, show youthful vitality, let your personality stand out from the crowd. The colorful led images will surely attract attention. Program support :Text, pictures, Image Animation. Backpack fabric: front piece: EVA nylon composite waterproof material, back piece: polyester material Screen size: 9.8in x 9.8in Color: Black Support points: 64 x 64 full color dot matrix display Screen: LED Supply voltage: 5 V Communication method: WIFI GPRS English manual.