Honeywell A700 Hardware Reference Manual page 123

Mute
NOTE
This applies to the SRX3 Headset only. This feature is not available on the SRX2 Headset.
User Action
Flip microphone boom up 90 degrees (vertical)
Headset Mode
N/A
LED Pattern
N/A
Tone
N/A
Unmute
NOTE
This applies to the SRX3 Headset only. This feature is not available on the SRX2 Headset.
User Action
Flip microphone down to mouth level.
101 Voice Device and Headset Hardware Reference Guide