1. Build-in high sensitivity dual-microphone, 360 degree high-definition stereo surround sound recording. Suitable for professional recorder in various occasions. 2. AGC audio effect auto adjustable, much easier for use 3. Adopted USA CS42L52 audio decode chip, recording and MP3 player can reach to the synchronization effect 4. Advanced pointer watch time clock feature, precise time. 5. Data will be intelligent protected when power off, even power accident also can guarantee the previous recording will not be lost 6. Build-in highly efficient Li-ion polymer rechargeable battery, can record and play for above 8 hours 7. Support WMA\MP3 etc. Multi-format audio play 8. Support song select function, device freeze the data will be deleted. 9. Two-key operation, one-key play. Easy and convenient to use. 10. Data storage function, data carry around, reliable and safe 11. Matte metallic materials and 72hours ion vacuum metalizing, sophisticated high-end, feel comfortable, not easy to wear and tear Products Specification: Capacity 128M-4G Support music format MP1 MP2 MP3 WMA MP3 bit rate 8K-320K WMA bit rate 32K-380K Signal-to-Noise 88db Headphone output power 40mw*2/16R/-75db Recording format MP3(128kbps) saved in the file of VOIC Port USB1.1 Data transmission rate reading speed 32Mbps,writing speed 28mbps Support system Windows 98/Me/2000/XP,Mac OS9.x/Mac OSX, Linux2.4 and above level MD 7 hours Power supply Li-ion battery Charging time 2 hours Charger input voltage 100-250V 50/60HZ Watchband Metal band Solution South Korea solution Chip NX5858