1. 3.5mm hole 2. Mashimaro MP3 player 3. USB 2.0 interface for high speed transmission 4. Can be used as a flash drive 5. Built-in rechargeable battery-charged by a computer via USB cable 6. Support MP3 file format 7. Dimension: 54x38x38 mm 8. Built in Memory: 2GB 9. Battery: 3.7V Li-ion battery 10 Available Color: White 11. Dimensions: 54 x 38 x 38 mm 12. Play Files: MP3, WMA, WMV, ASF, OGG, APE, WAV, ACT 13. Material: Plastic