ADS-TEC OPC6012/6015 - Manual (Page 24)

OPC6012/6015 23
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6.3 Speakers
The OPC60xx is equipped with two internal speakers.
Note:
The volume can be set up by using the device front keys. When activating the
described key combinations, the volume level is modified. If the soft keyboard is
installed, the system volume is additionally displayed by a display bar.