Features:1. Power switch/record switch. 2.''+'' volume plus/key for next song. 3.''_''volume minus/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/mp3 format 8. High capacity 9. Built-in rechargeable lithium battery10. USB storage write protection 11. one-touch recording & 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 functionSpecifications:Battery capacity: lasting for about 3-5h while continuously recordingLasting for about 3-5h while continuously playingRecording format: WAVMusic format: MP3/WMA/WAVSampling frequency: 48KHZBits: 192KBPSSize: 47*19*7mmRemarks: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 8/16/32GB voice recorder 1x user manual