See also:

Using the hands-free phone system for the first time
Before using the hands-free phone system, it is necessary to register a cellular phone in the system. The system will enter phone registration mode automatically when starting the system with no c ...

Open source license
This product uses the following open source software. · T-Kernel This Product uses the Source Code of T-Kernel under T-License granted by the T-Engine Forum (www.t-engine.org). · C Library ...

Adjusting sound quality and volume balance
 - Changing sound quality modes Press the “TUNE/SEL” knob. Pressing the button changes sound modes in the following order: “BAS” → “MID” → “TRE” → “FAD” & ...