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■ Sound meter
The sound meter enables you to measure the approximate noise level of the 
environment.
It provides general measurements for personal use that may vary from scientific 
measurements.
You cannot measure the noise level during a call or while a headset is connected 
to the phone.
To start sound monitoring, select Menu > Media > Sound meter.
The sound meter bar graphically shows the noise level, and the peak level is 
indicated. The upper number indicates the peak level and the lower framed 
number the current level of the sound.
To open the list of options, select Options.