Just save your loved songs in TF card and then play them with this sport player Comfortable and secure for most users: bicyclist, runners, joggers, walkers, etc Enjoy your sports and music at the same time Built- in rechargeable li-po battery Power by USB Cable Dimension: 15cm x 13cm x 2.5cm Net weight: Approx 30g Easy to convenient to use Note: Headset jack is relatively easy to pull out, so pay attention when using Package Content: 1x Sport Mp3 (Without retailing packing) 1x Usb Cable