ONN W6 MP3 Bluetooth MP3 Pedometer MP3 Player Sport MP3 MP4 Player MP3 8GB Dark Blue Bluetooth Function, you can play the music through Bluetooth speaker or Bluetooth headset Built-in lithium battery 450mah, Rechargeable Battery Get up to 60 hours of music playback, recording up to 100 hours on a single charge with RKnano chip,perfect sound quality ,It has various playing modes,8 GB memory capacity,supports up to 32 GB Micro SD Card Lossless acoustics; support multiple music formats: MP3, WMA, WMA, APE, FLAC, WAV, AAC-LC. Please feel free to contact us