Yes. The unit allows you to listen through the tracker's built-in microphone. You can listen to conversation within range of the tracker like conversations inside the car if the tracker is placed there. When the tracker is in the Monitor Mode there'll be no feedback sound.
Track Mode is the default mode of the tracker and when in this mode you would get the GPS coordinates of the device every time you call it to track.
To switch from tracker mode to monitor mode just simply send the text command below to your tracker.
Message Format: monitor+password
Text Message Sample: monitor123456
Then, wait for the reply of the tracker, "monitor ok" to verify that the mode has been successfully switch.
To switch back to tracker mode from monitor mode, send the following command:
Message Format: tracker+password
Text Message Sample: tracker123456
And, wait for the reply again from the tracker, "tracker ok".