APX 4500 O2 CH 
22 
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 Using the Keypad (on Keypad Mic) 
Keypad Characters – Numeric Mode 
IDENTIFYING RADIO CONTROLS 
  Number of Times Key is Pressed 
Key  1  2  3  4  5  6  7  8  9  10  11  12  13  14  15  16  17  18  19  20 
1  .  ,  ?  !  ;  @  _  -  *  #  &  $  /  +  =  \  "  (  ) 
2 
3                                   
4                                   
5 
6                                   
7                                
8                                
9                                
 0 
Space 
Toggle between numeric and letter mode.