Bolayu USB Mini LCD Screen MP3 Player Support 32GB Micro SD TF Card (Green) Headphone Jack: 3.5mm stereo Jack. Music Equalizer: Natural, Pop, Rock, Classic, Jazz, Soft, DBB. Material: Metal. Size: 4.8cm x 3cm x 1.5cm - 1.87" x 1.17" x 0.59". Build-in Li-ion rechargeable battery, directly connect with PC for recharging. Plays mp3 music. Simply copy/paste the mp3 files from your PC to the MP3 player and you are ready to go.