Have the unit recently bought, unfortunately, the joy was not only times large. For recorded video clips in the quiet location you could perceive a high-frequency whistle during playback. So called Support for Aiptek, described problem. Mr. on the phone asked me for a few days of patience. Have again notified by mail my problem. After a few days I got an email that the problem was to eliminate by means of a firmware update. Got the file by mail, including description, the update have been playing with some simple steps. Immediately tested, behold the problem was eliminated. Such a support I praise, great service ....