DeRoyal Olympus DM-620 Digital Recorder 1,000 hours of record time on this small digital player and recorder. Has 4GM of internal memory and a SD slot to support up to 32 GB. Features a built in 3 microphone system (high sensitivity stereo microphones & a center microphone. Able to play WAV, WMA, & MP3 format files transferred from a computer. Dimensions: 4.36" (110.8 mm) x 1.56" (39.8 mm) x .61" (15.4 mm)