Sony MZ-B100 MiniDisc Business Recorder Records separate left and right channels in stereo with built-in flat microphone Up to 320 minutes recording time allows extended recording times ? records more than 5 hours in MD-LP mode using standard MiniDiscs Voice Operated Recording ( VOR ) conserves disc space, eliminating soundless passages Up to 12 hours playback (43 hours monaural) with 1 AA battery (not included) Playback speed control (+30% / -15%) allows easier review of recordings