2N NetStar Assistant manual - Manual (Page 42)

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Volume
Key click volume – set the handset or HandsFree volume for a key click.
Handset volume – set the handset volume.
HandsFree volume – set the HandsFree/Speakerphone volume.
Ringing volume – set the ringing volume.
Display
LCD contrast – set the phone display contrast.
Time format – set the time format to be displayed: 24 or 12 hours.
Key timeout – set the delay between subsequent characters while editing.