This is an ultra-compact voice recorder. It can record up to 64GB of audio. The set includes the main unit, instruction manual, and PC connection cable. The size is approximately 5.5cm (length) x 2.5cm (width) x 1cm (thickness). It also has a strap hole. For accurate recording, "the recording function of smartphones is often unreliable." Also, "recording using a smartphone can make the other person wary." Therefore, there are situations where the use of such a recording device is necessary. The main unit has software that automatically records the date and time. You can easily start and stop (save) recording with just the on/off button. Video recording is not possible.