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Main features:LED dynamic backpack is designed to be waterproof and waterproof.Walking expression pack, do funny soul, LED dynamic backpack, cool trend fashion.LED dynamic backpack adds a LED screen inside, through the scan code link, you can freely edit and send various patterns, texts, animations, change expression packs anytime and anywhere, show youthful vitality, let personality stand out from the crowd And the mountains are Easy to attract attention.Program support: text, pictures, animationProduct parameters:Backpack size: 44 x 35 x 13CMBackpack fabric: front piece: EVA nylon composite waterproof material, back piece: polyester materialScreen size: 25 x 25CMSupport points: 64 x 64 full color dot matrix screenPower information:Power supply mode: power bank Rated voltage: 5VConnection method: GPRS WIFIGeneralBag Capacity: 20L For: Camping, Casual, Other, Sports, Traveling Gender: Unisex Strap Length: 42 - 79cm Style: Cool Type: Backpack Specification General Type: Backpack For: Other,Traveling Material: Oxford Fabric Strap Length: 42 - 79 cm Specifications Product weight: 0.8300 kg Package weight: 0.8500 kg Product size (L x W x H): 44.00 x 35.00 x 13.00 cm / 17.32 x 13.78 x 5.12 inches Package size (L x W x H): 45.00 x 36.00 x 14.00 cm / 17.72 x 14.17 x 5.51 inches Package Contents Package Contents: 1 x Backpack