The ambient noise volume is constantly measured and automatically adjusted to the noise volume + specified volume.

If you usually set the volume to a level that does not bother you at your company, you will not hear anything when you get in the car. Eliminate the hassle.


※For smartphones with battery saving mode,
　Auto-startup and background services may not work correctly.
　In that case, Please allow it yourself from the individual app settings on the system settings menu.