Standard Horizon HX400 Owner's Manual page 18

Key
Press the key momentarily to decrease the channel one step. Hold the key
down to decrease the channel continuously.
Secondary use:
Used to adjust the squelch threshold level down after the
Key
Press this key to activate the squelch adjusting mode. Press the
key to adjust the squelch threshold level.
Secondary use:
Press and hold this key for two seconds to open the squelch, allowing you
to monitor the operating channel. Release the key to resume normal (quiet)
monitoring.
Key
Starts scanning and priority scanning of programmed channels.
Secondary use:
Press and hold the
feature.
Key
Press to stop the Scan, Priority Scan, or Dual Watch feature.
Secondary use:
Press and hold this key to immediately recall the last-used NOAA Weather
Channel from any channel location. Recalls the previously- selected work-
ing channel when the
Advanced use:
When the
the marine band between the USA, International, and Canadian channels.
Speaker
The internal speaker is located here.
Microphone
The internal microphone is located here.
When transmitting, position your mouth 1 inch (2.5 cm) away from the
small mic hole. Speak slowly and clearly into the microphone.
Battery Pack Lock ( Bottom side )
Slide the Battery Pack Lock to the " " position for battery removal.
Page 18
key for two seconds to activate the Dual Watch
key is pressed again.
key is held and the key is pressed, the radio will change
key is pressed.
or
HX400