The AR-200 features built-in 4 GB of memory that is perfect for recording hours of audio. This state-of-the-art audio recorder features a high grade super sensitive AGC microphone that gives you great crisp and clear recording ability. Operational time is up to 32 hours and this little gem will stay in place ready for use for 80 hours in standby mode. You have three recording modes that include manual mode, voice activated mode, and auto mode.