Sony PCM-M10 Portable Linear PCM Voice Recorder with Electret Condenser Stereo Microphones, 96 kHz/24-bit, 4GB Memory & USB High-Speed Port - White Offers solid-state storage - free of drive mechanisms Built-in high quality electret condenser stereo microphones The PCM-M10 includes both digital pitch control and key control. Digital pitch control maintains pitch while slowing down or speeding up playback speed. Key control allows changing the pitch while maintaining playback speed. The PCM-M10 conforms to the USB 2.0 Mass Storage Class Device standard and this recorder's native recording file formats include .WAV and .MP3. The PCM-M10 offers comprehensive signal processing features for location recording including: digital limiter, auto record level control and a digital low cut filter.