AEC Wireless Sport MP3 WMA Player Headset Headphone with Micro SD TF Card Slot + FM Radio-Black Support the TF card of 1-32 GB, Support formatMP3WMA With charging Li-battery, Charging time 1 to 2 hours Swithing between FM and MP3 music Batterys supporting ability: Over 8 H Computer connection wayUSB2.0 high-speed transmission