User's Manual
20S
55
English
25 OPERATION QUICK REFERENCE
Type Function
Button Command
Voice
Command
LED Beep
Button Duration
Basic
Function
Power-on
Phone Button
+ Jog Dial
1 sec -
Solid
blue
Ascending
beeps
Power-off
Phone Button
+ Jog Dial
Tapping - Solid red
Descending
beeps
Volume
adjustment
Jog Dial Rotating - - -
Voice
command
Surface of the
main unit
Double
tapping
“Hello Sena!”
Green
Flashing
-
Ambient
Mode
Ambient Mode
Button
Pressing -
Green
flashing
-
Mobile
Phone
Mobile phone
pairing
Phone Button 5 sec -
Blue &
red alter-
natively
flashing
High tone
multiple
beeps
Second
mobile phone
pairing
Jog Dial 6 sec -
Red
flashing
Multiple
beeps
Phone Button within 2 sec
Call transfer Phone Button 2 sec - -
High tone
single beep
Answer &
end phone
call
Phone Button
or Jog Dial
Tapping - - -
Voice dial Phone Button Tapping - - -
Type Function
Button Command
Voice
Command
LED Beep
Button Duration
Mobile
Phone
Speed dial Phone Button
Double
tapping
“Speed dial
[one, two, three]
”
-
Mid-tone
single beep
Reject
incoming
call
Jog Dial 2 sec - - -
Intercom
Intercom
pairing
Jog Dial
6 sec
“Pairing
intercom”
Red
flashing
Mid-tone
single beep
Jog Dial of any one of the two headsets
Start
intercom
Jog Dial Tapping
“Intercom
[one, two … nine]
”
- -
End intercom Jog Dial 2 sec
“End
intercom”
Blue
flashing
Mid-tone
single beep
Start Group
Intercom
Ambient Mode
Button
1 sec
“Group
intercom”
Green
flashing
-
Music
Play/pause
Bluetooth
music
Jog Dial 1 sec
“Music”
-
Mid-tone
double beep
Track
forward/
back
Jog Dial
Rotating
while
pressing
“Next”/
“Previous”
- -
FM radio
FM radio on Phone Button 2 sec
“FM radio”
-
Mid-tone
double beeps
FM radio off Phone Button 2 sec
“FM radio”/
“Stop”
-
Mid-tone
double beeps
Select preset Phone Button Tapping
“Next”
-
Mid-tone
single beep










