Charging function: With External USB charging port & set-in charging cable, offer a convenient way for you to charge your electronic device when walking.Recommended Age Grade: 3+years old boys girls. Headphone function: With External Headphone Jack & set-in Headphone cable, you can enjoy your favorite music on the go hands-free. Durable Fabric: Made of High quality 600D Nylon Fabric, Lightweight, Scratch-resistant, Anti-tear & Anti Water Splashing. Application: This backpack is perfect to be a daypack. Perfect for back to school, work, weekend get-away, biking, camping, gym, travel, etc. Multiple compartments: Total 6 Compartments to save your belongs well. large capacity for binders, books, folders, pencil case, tablet, laptop, purse etc.