Features‎:‎1‎.‎Built‎-in TF/ micro SD card slot support up to 8GB TF/ micro SD card‎(‎ card NOT included‎)‎‎.‎2‎.‎Just save your loved songs in TF/ micro SD card and then play them with this sport player‎.‎3‎.‎Doubles as a TF/ micro SD card reader if connect it to computer‎.‎4‎.‎Supports MP3 WMA music format‎.‎5‎.‎Built‎-in rechargeable li‎-on battery and charge by USB cable‎.‎6‎.‎Easy to use‎,‎ ‎"‎On/ off‎"‎ toggle and 3 Key‎-press‎:‎ Play/ Pause‎,‎ Volume / ‎-‎(‎long press‎)‎‎,‎Previous/ Next ‎(‎short press‎)‎‎.‎7‎.‎Comfortable and secure for most users‎:‎ bicyclist‎,‎ runners‎,‎ joggers‎,‎ walkers‎,‎ etc‎.‎8‎.‎Wrap around wire free headphones‎,‎ designed to stay on your head‎.‎9‎.‎Great quality‎,‎ super stereo sound lets you enjoy your sports and music at the same time‎!‎Specifications‎:‎1‎,‎Color‎:‎Green2‎.‎Audio format‎:‎ WMA‎,‎ MP33‎.‎S/N ratio‎:‎ ‎?‎ 86db4‎.‎Output frequency‎:‎ 20Hz—20KHz5‎.‎Port‎:‎ Mini USB6‎.‎Battery‎:‎ DC 3.7V Li‎-po battery7‎.‎Charge time‎:‎ 2‎-3 hours8‎.‎Playtime‎:‎ Approx‎.‎3 hours9‎.‎Supporting system‎:‎ Windows 98/ ME/ 2000/ XP/ Vista/ 7‎,‎ iOS10‎.‎Working temperature‎:‎ 0 Celsius degree‎-45 Celsius degree11‎.‎Headset size‎:‎ Approx‎.‎ 14 * 13cm/ 5.5 * 5.1in