Record up to 138 hours or store up to 120 songs on 512 MB of internal flash memory. Built-in stereo microphones and a Stereo Extra-High Quality (STXQ) mode let you record and play in superior-sounding audio. Five other recording modes include STHQ, STSP, HQ, SP or LP. The no-hassles Windows Media Audio (WMA) format works seamlessly with any PC. You can conserve memory with the Variable Control Voice Actuator that records only when sound is sensed. Continuously record for 21 hours with one AAA battery. Doubles as a USB storage device! Store any type of file and stay organized with five folders that each hold 200 files. Always know where important passages are with an index mark feature. Our ¿USB Direct¿ design lets you plug the recorder right into your computer for easy, high-speed transfers using USB 2.0. And listen to MP3 and WMA files while WOW XT Technology provides rich bass and three-dimensional sound during playback. Customize the sound using a built-in equalizer. Accelerate or slow down audio with eight different playback speed variations to help you listen efficiently.