Features:1. Power switch/recording switch.2. '+' volume plus/next song button.3. '_' volume minus/mp3 music conversion button4. 3.5mm jack5. Working indicator light6. Lasts for about 48 hours for 4GB of continuous recording7. Recorded file in WMA/mp3 format8. High capacity9. Built-in rechargeable lithium battery10. USB storage write protection11. One-touch recording & high-quality recording12. Recording via high-quality built-in microphone13. Telephone call recording14. Works as a driver-free USB flash disk15. MP3 functionSpecifications:Battery capacity: lasts for about 3-5 hours of continuous recordingLasts for about 3-5 hours of continuous playbackRecording format: WAVMusic format: MP3/WMA/WAVSampling rate: 48KHZBit: 192KBPSSize: 47*19*7mmNotes:Due to the recording effect of this product, relatively clear quality and high parameters that have reached the highest parameters, the recording file is relatively large, please extract and save the recording file in timeWarning 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 recorder1x user manual