Nexx X-com, User Manual

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4.4 Low Batter y Warning
When the battery is low, the blinking blue LED in stand-by mode
turns to red and you will hear mid-tone triple beeps and a voice
prompt,
 .
4.5 Checking the Battery Level
You can check the battery level in two different ways when the
headset is powering on.
4.5.1 LED Indicator
When the headset is powering on, the red LED flashes rapidly
indicating the battery level.
4 flashes = High, 70~100%
3 flashes = Medium, 30~70%
2 flashes = Low, 0~30%
4.5.2 Voice Prompt Indicator
When you power on the headset, keep pressing the Center Button
and the (+) Button simultaneously for several seconds until you
hear high tone triple beeps. Then you will hear a voice prompt
indicating the battery level. However, if you release the buttons as
soon as the headset turns on, you will not hear the voice prompt
giving the battery level indication.
5. VOLUME ADJUSTMENT
You can easily adjust the volume by tapping the (+) Button or
the (-) Button. You will hear a beep when the volume reaches
maximum or minimum level. The volume is set and maintained
independently at different levels for each audio source even when
you turn the headset off and on. For example, once you set the
volume for mobile phone handsfree, it will not change even if you
adjust the volume when you hear Bluetooth MP3 music. So you
can always maintain the preferred optimum volume level for each
audio source.