The Olympus WS-822 Digital Voice Recorder (Blue) can record and playback audio files using LPCM, WMA and MP3 formats. The internal 4GB memory supports up to 1000 hours of recording and the included rechargeable battery can power the recorder for up to 37 hours. It also has a microSD card slot, so you can add an additional 32GB of external memory. The WS-822 is equipped with two internal directional condenser microphones. It has a built-in USB 2.0 connector as well, which supports direct connectivity with your PC or Mac - no USB cable is required. The recorder has a built-in mic with noise cancellation technology, but it also has a microphone jack for connecting an external mic. It supports Voice Balancer and Voice Playback functions as well. Other features include a calendar search function, a scene select function, six folders that hold up to 200 files each and support for up to 99 index marks per file.