M21 1.77 inch MP3 With Bluetooth, Memory Capacity: 8GB 1. Screen material: Gl 2. Mirror material: PC plastic 3. Display: 1.77 inches 4. Leather screen type: TFT color screen 5. USB interface: USB 2. 06. Headphone jack: 2.0mm 7. Battery capacity: 200 mA 8. Recording format: WAV/MP 39. Music format: MP3/WMA/WAV/APE/FLAC 10. Bluetooth version: Bluetooth 4. 011. Support English-Chinese dictionary translation 12. Support memory card expansion 13. Multi-format video can be played 14. Rich vocabulary, easy to learn English, more efficient spling 15. Loudspeaker loudspeaker, high- HIFI sound effect 16. Intligent full-screen reading of s, bookmarks can be saved, 8-lev variable speed playback, four kinds of reading backgrounds can be replaced, intligent A-B reading 17. back clip type, convenient to carry and use 18. Dimensions: 51x41x16.6 mm 19. Weight: about 120 grams with accessoriesPacking list: 1. Main unit x 12. Packing box x 13. Earphone x 14. Data cable x 15. Warranty card x 16. Manual x 1