[Mini voice recorder small size] Ultra-small size-diameter: 3.5cm & thin: 0.8cm, light weight only 11g, small voice recorder is easy to carry, put it in your wallet, pocket, briefcase, you can quickly perform daily recording. This small listening device is very suitable for lectures, interviews, classrooms, meetings, etc. This recording device can also be used as an MP3 player.[One key recording & voice activation] One key can quickly start recording and save the recording. And with voice active recording mode (need to be set first), it will record when sound is detected (more than 50dbs), and stop recording when no sound is detected, to ensure full use of memory. Note: If your computer cannot play recording files, you need to download a software that can support "WAV" format recording files.[Professional recorder parameters] This mini recorder is equipped with a 120mAh rechargeable battery, which can record continuously for 18-20 hours, built-in 16GB memory card, 192KBPS can save 192 hours of recording files, and the best sound quality can reach 384KBPS (setup required). The intelligent recording function enables the recorder to save recording files for 5 hours at a time. Full charge time: 1 hour.[Digital recorder with playback function] Connect the voice-activated mini recorder to the computer and synchronize the time before recording. When playing on the computer, please use a player that supports WAV format recording files, or listen to the recording on the device through headphones, or quickly view the recording files through an Android phone with OTG function. Using high-definition noise reduction chip to minimize the noise, you will get high-fidelity recording.