Kenwood Nexedge NX-220 Instruction Manual page 19

Side 2 key
Press to activate its programmable function {page 0}.
The default is Backlight.
S, A, <B, C> key <Type I, II>
Press to activate its programmable function {page 0}.
S key: The default setting is [None] (no function).
A key: The default setting is [None] (no function).
<B key: The default setting is [Channel Down].
C> key: The default setting is [Channel Up].
Keypad <Type I>
Press these keys to send DTMF tones. These keys can
also be programmed with secondary functions {page 0} if
a programmable function key is programmed as "Function".
Speaker/ Microphone jacks
Insert the Speaker/ Microphone or Headset plug into
this jack.