Nokia BH-902 ユーザーズマニュアル

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■ Display
When the headset is on and it is not used for about 
10 seconds, the display enters the power saving mode. In 
this mode the display turns off for about 5 seconds and 
turns on for about 1 second at regular intervals.
To activate the display when it is in the power saving mode, 
briefly press the answer/end key or either volume key; to 
display the list of menus, press the power key.
To view the current time and battery status when you are 
not in a menu or in a call, press either volume key.
The essential display indicators are the following:
The headset is connected to a compatible device 
and ready for use.
The headset is not connected to a compatible 
device.
There is an incoming call.
A call is in progress.