Voice activated recording: the device records when the sound detects automatically and stops recording when the sound stops. With this function, you only register what is important and save storage space. It is also much easier to find relevant recordings from the audio file. With the automatic time marking, the date and time are recorded into the audio.LONG LASTING RECORDING: The battery allows the device to record 30 days with voice activation and 18 hours of continuous recording. It takes 2 hours to be fully charged. The memory allows 180 hours of recording time. USB chargingOne of the smallest recorders. Dimensions: only 4.5 x 4 x 0.3 cmDIGITAL NOISE REDUCTION - Use professional DSP recording processor with high resolution noise reduction to ensure the audio is clear and sharp.