With advanced intelligent noise reduction technology, the audio recorder automatically reduce ambient noise, you'll get clearer sound at many occasions like lectures, meetings, interviews and class. A Perfect Choice for Your Daily Recording!With built-in 64GB large memory, this digital voice recorder can store up to 3500 hours of recording files (at 32kbps). In addition, the voice recorder has a built-in 1200mAh rechargeable high capacity battery, fully charged can be used for up to 150 hours continuous recording, 250 hours playback. It is a professional daily recording device without fear of recording power outages.This digital voice activated recorder can set voice decibels at 5 different levels. Set a proper voice decibel level, the voice activated recorder will automatically start recording when detects sound and stop when no sound detected. Effectively save memory space and time. This vioce recorder support auto recording, just set and forgot it, the audio recorder automatically recording and saving file at scheduled time cycle (Keep POWER button at ON position).The one button voice recorder can start/saving recordings quickly. It's easy to operate with HD OLED display screen. Recording files can be managed easily at device, computer and phone(OTG function). Multi-usage as a voice recorder, an USB flash drive, and a Mp3/Mp4. The tape recorder works with all the functions you want *File Transfer, Built-in speaker, 3.5mm Earphones, Multi-languauge, Password, A-B Repeat, Segment recording, Monitor Mode, E-book etc.