External Usb Interface & Headphone Jack: It Adopt A Convenient Charging System, A Detachable Data Cable Is Provided Inside The Front Pocket Where You Can Put Your Power Bank(Not Supplied) In, Then Easily Charge Your Electronic Device By Plugging Into The Usb Port While Working Or Walking. Headphone Jack: There Is An External Headphone Hole, You Can Listen To The Music On The Go Hand-Free.
