The Sony ICD-PX470 is a digital voice recorder featuring a built-in USB for easy file transfer, 4GB of expandable memory, and various recording modes like Auto Voice Recording and Scene Select for optimizing audio in different environments, such as meetings or lectures. It records in both high-detail Linear PCM and compressed MP3 formats, offers a long battery life, and includes features like a calendar search function and a transcription playback mode for finding files and transcribing speech more easily.