Standard Horizon QUANTUM GX6500E Owner's Manual page 38

When an optional RAM4 mic is connected and intercom mode is selected,
pressing the PTT switch enables voice communications from the GX6500E/
GX6000E to the RAM4 second station microphone.

Microphone speaker
Audio heard through internal radio speaker is heard through speaker inside
the microphone.

▲/▼ key
These keys on the microphone are used to select channels and to choose
menu items.

16/S key
Pressing this key immediately recalls channel 16 from any channel loca-
tion. Holding down this key recalls the SUB channel (The default setting is
channel 9). Pressing this key again reverts to the previous selected working
channel.

H/L key
Press this key to toggle between 25 W (High) and 1 W (Low) power. When
the TX output power is set to "Low" while the transceiver is on channel 13
or 67, the output power will temporarily switch from "Low" to "High" power
until the PTT switch of the microphone is released. This key is not function
on transmit inhibited and low power only channels.

Microphone
When spoken into transmits your voice with reduction of background noise,
using Clear Voice Noise Reduction Technology.
Note: Position your mouth about 1/2" (1.5 cm) away from the microphone
hole and speak in a normal voice.
Page 38 GX6500E/GX6000E