Features: 1. Power switch or record switch. 2.'and' volume plus or key for next song. 3.'_'volume minus or mp3 music conversion key 4. 3.5mmjack 5. Work indicating lamp 6. Lasting for about 48h for 4GB while continuously recording 7. Recorded file in WMA or mp3 format 8. High capacity 9. Built-in rechargeable lithium battery 10. USB storage write protection 11. one-touch recording and high-quality recording 12. Recording via high-grade built-in microphone 13. Recording the phone conversation 14. Working as drive free USB flash disk 15. MP3 function Specifications: Battery capacity: lasting for about 3-5h while continuously recording Lasting for about 3-5h while continuously playing Recording format: WAV Music format: MP3 or WMA or WAV Sampling frequency: 48KHZ Bits: 192KBPS Size: 47 x 19 x 7mm Remarks: Due to the recording effect of this product, relatively clear quality, and high parameters having reached the top parameters, the recording file is relatively big, thus, please extract and save the recording file timely Waring tips: this machine comes with an intelligent reset system, please save the file being recorded before connecting the computer. Package includes: 1x 8 or 16 or 32GB voice recorder 1x user manual