For users who need a long recording time or need to be able to capture sound in high quality for longer, the smart silver DS-40 is ideal. Its integrated 512MB memory provides over 136 hours of recording time in LP mode, over 17 hours in SHQ stereo or over 8 hours in XSHQ stereo mode. In addition to recording and playing WMA files, with the DS range you can listen to MP3 and AA (Audible content) files.