【Built-in Magnet】The size is 1.33*1.33*0.3in, the weight is 0.38 ounces, and the recorder has a built-in magnet, which can be installed on magnetic metal, easy to use. 【Built-in lithium-ion battery】The recorder provides up to 24 hours of continuous recording after full charge and can store approximately 100 hours of audio files. 【AGC Automatic Gain Control】 Gain compensation is performed through the AGC algorithm, making the recording more realistic. 【DSP intelligent noise reduction chip】The built-in DSP intelligent noise reduction chip uses reverse sound waves to offset noise. Compared with ordinary recorders, the noise reduction effect is improved by 15%. 【WAV recording format】The recording file is in WAV format, which is clearer than MP3 format.