This is a simple voice recorder. For recording, you can select the linear PCM (WAV) format for lossless compression or the AAC format for lossy compression. Also supports long-time recording in the background. The sampling rate can be changed to 8k, 16k, 44.1k, 48kHz. * Call recording is not supported. Record: - Recording in high-quality linear PCM (WAV) format - Recording in highly compressed AAC (M4A) format - Recording in the background - Change of sampling rate (8k, 16k, 44.1k, 48kHz) - U