Andoer Sport MP3 WMA Music Player TF/ Micro SD Card Slot Wireless Headset Headphone Earphone (Green) Just save your loved songs in TF/ micro SD card and then play them with this sport player. Doubles as a TF/ micro SD card reader if connect it to computer. Supports MP3 WMA music format. Built-in rechargeable li-on battery and charge by USB cable. Easy to use, "On/ off" toggle and 3 Key-press: Play/ Pause, Volume+/ -(long press), Previous/ Next (short press).