Sena SFR User Manual page 28

SFR
13.2.9 Intercom VOX Sensitivity (Default: 3)
VOX sensitivity can be adjusted depending on your riding environment.
Level 5 is the highest sensitivity setting and 1 is the lowest.
13.2.10 Voice Prompts (Default: Enable)
You can disable voice prompts by software configuration settings, but
the following voice prompts are always on.
– Headset configuration settings menu, battery level indicator, speed
dial, FM radio functions
13.2.11 RDS AF Setting (Default: Disable)
Radio Data System (RDS) Alternative Frequency (AF) Setting allows
a receiver to re-tune to the second frequency location when the first
signal becomes too weak. With RDS AF enabled on the receiver, a
radio station with more than one frequency can be used.
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13.2.12 FM Station Guide (Default: Enable)
When FM Station Guide is enabled, FM station frequencies are given
by voice prompts as you select preset stations. When FM Station
Guide is disabled, the voice prompts on FM station frequencies will
not be given as you select preset stations.
13.2.13 Sidetone (Default: Disable)
Sidetone is audible feedback of your own voice. It helps you to
naturally speak at the correct level according to varying helmet noise
conditions. If this feature is enabled, you can hear what you are
speaking during an intercom conversation or a phone call.
13.2.14 Advanced Noise Control™ (Default: Enable)
When Advanced Noise Control is enabled, the background noise is
reduced during an intercom conversation. When it is disabled, the
background noise is mixed with your voice during intercom.