Voice Tracer Digital Recorder delivers precise conversation recording with automatic adjustment of audio settings for different environments so you enjoy optimal recording quality. AutoAdjust Plus analyzes the audio signal and chooses the perfect settings for the recording situation. The result is crystal-clear recordings. High-quality microphone allows utmost speech clarity. MP3 recording provides clear playback and easy file sharing. Operation is easy and intuitive with plug and play in Windows, Mac OS and Linux and a large color display. Rechargeable li-polymer battery allows extra-long recording. 4GB internal memory allows up to 44 days of recording. MicroSD memory card slot allows virtually unlimited recording. Robust metal design offers extra durability.