The Olympus DP-311 combines the simplicity of analogue cassette notetakers with state of the art digital performance, so users get the best of both worlds. Its easy to capture notes, conversations and loud sounds including singing. Files are saved in MP3 format in the ample 2GB internal memory or on SD/SDHC Cards for extra versatility. Dot matrix. Built-in memory 2 GB. Voice activated. Recording time 166 hours. Twin speed recording. 3 recording qualities. Dictation and conference recording modes. Slow_fast playback. 1 folder. Built-in microphone. Storage via SD. WMA files can be transferred and played. USB cable, microphone, . General information: Weight 96g. Size H10.5, W5, D2cm. Batteries required 2 x AA (included) . Manufacturers 2 year guarantee.