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Select Switch - Selects zones/channels and is also used for other functions such as 
selecting names from a call list. When selecting zones/channels, a bar above the zone or 
channel display (see Figure 2.3) indicates which is being changed. This bar is switched 
between displays by pressing this switch, and zone and channels are selected by rotating it 
(see Section 3.4.2). 

Multi-function Indicator - This is a two-color LED that indicates the following:

Red (constant) - Transmitter keyed (PTT switch pressed).

Green (constant) - Busy condition (carrier detected in receive mode).

Option Switches - Each of the six options switches on the front panel (including the one 
located to the left of the display) can be programmed by your system operator to control 
some function. The switch functions can be different for each operating mode 
(conventional, SMARTNET/SmartZone, and Project 25 Trunked). Therefore, up to 18 
functions can be controlled by these switches. Refer to Section 4.1 for more information 
on option switch functions.

Speaker - An internal 16-ohm, 5-watt speaker is located behind the grille. An optional 4-
ohm, 12-watt external speaker may be used if desired. The internal speaker is disabled 
when an external speaker is used.

PTT Switch - This push-button switch on the microphone is pressed to talk (key the 
transmitter) and released to listen.