【1536Kbps Voice Recorder】The audio recorder equipped with professional recording chip, 2 built-in AGC noise reduction microphones, efficiently reduce background noise, supports up to 1536kbps stereo audio recordings. Built-in speakers can playback recordings and music directly. The files are saved in MP3/WAV format. The recorder can also be used as MP3 player or flash drive that compatible with Windows and Mac. Ideal recording device for lecture, meeting, interview, class, journalist and so on.【16GB Digital Recorder】Portable recorder(80*25*10mm--size like lipstick; 52g) built-in 16GB internal memory, can store recordings(Voice Mode) from 12 hours(WAV 1536kbps) to 1160 hours(MP3 32kbps) or 2000 songs(Music Mode). Built-in 400mAh rechargeable lithium battery, support up to 30 hours continuous recording after 3 hours single fully charged. Charges or transfer files via supplied Micro-USB cable. Can also use the OTG converter manage files on your phone directly(Android phone).【Voice Activated Recorder】This recorder has 7 different levels voice decibels. When the "AVR" function is activated, the sound will be detected automatically during recording. When the sound reaches the decibel standard, the sound recorder will start recording. When the sound is lower than the certain decibel standard, the recording will pause after about 2 seconds. Which can avoid invalid recording, save recording time and capacity. Note: must turn on the "AVR" mode could achieve the function.