Features: 1. Power switch/record switch 2. Volume up/next track key 3. Volume down/MP3 music conversion key 4. 3.5mm jack 5. Work indicator lamp 6. Lasts approximately 48 hours for 4GB during continuous recording 7. Recorded files 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. Records via high-grade built-in microphone 13. Records o from phone calls 14. Functions as a driver-free USB flash drive 15. MP3 playback function Specifications: Battery capacity: lasts approximately 3–5 hours during continuous recording Lasts approximately 3–5 hours during continuous playback Recording format: WAV Music format: MP3/WMA/WAV Sampling frequency: 48kHz Bit rate: 192kbps Dimensions: 47 x 19 x 7mm Remarks: Due to the recording performance of this product, the o quality is relatively clear and the parameters are high, resulting in larger file sizes. Please transfer and save recorded files promptly. Warning: This device features an intelligent reset system. Please save any ongoing recording files before connecting to a computer. Package includes: 1 x 8/16/32GB voice recorder 1 x user manual