COBY CV-M225 - Manual (Page 9)

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Using Your Headset
Adjusting the Volume
During a call, the volume can be increased with the volume
button, which will be accompanied by a short tone. When the
volume is at maximum, you will be alerted with two short tones.
When reducing the volume with the volume button, there will
be a short accompanying tone. When the volume is at its low-
est level, you will alerted by two short tones.