Honeywell Thor VM3 User Manual page 191

By default the side tone is muted. If needed, the user should enable the side tone. If this
causes interfering noise, the side tone should be disabled. The VM3 audio is designed
to be used with or without the side tone. This is acceptable permissible performance for
the Thor VM3.
Use the radio buttons to enable or disable the sidetone.
Tap and hold the Record Gain or Sidetone sliders and move either left or right, or tap the
left and right arrows, to adjust the levels.
Thor VM3 with Microsoft Windows Embedded Compact 7 User Guide 179