Appears when you aren't using the full 50W to save battery or reduce interference. 2. Essential Operations
The red button can be programmed to send a silent emergency signal or a specific DTMF code to a dispatcher. 3. Programming the IC-F121 icom icf121 manual
While pushing and holding both and DOWN keys, push [POWER] to enter Set Mode. Appears when you aren't using the full 50W