Features: 1. Power switch/record switch. 2. '+' Volume up/next song button. 3. '-' Volume down/MP3 music conversion button. 4. 3.5mm jack. 5. Working indicator light. 6. Lasts approximately 48 hours for 4GB in continuous recording. 7. Recorded file in WMA/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-quality built-in microphone. 13. Recording of phone calls. 14. Functions as a driver-free USB flash disk. 15. MP3 function Specifications: Battery capacity: Lasts approximately 3-5 hours in continuous recording Lasts approximately 3-5 hours in continuous playback Recording format: WAV Music format: MP3/WMA/WAV Sampling rate: 48KHZ Bit: 192KBPS Size: 47*19*7mm Notes: Due to the recording effect of this product, with relatively clear quality and high parameters reaching the highest levels, the recording file is relatively large, so please extract and save the recording file in time. Warning tips: This machine comes with an intelligent recovery system, please save the file being recorded before connecting to the computer. Package includes: 1x 8/16/32GB Voice Recorder 1x User Manual