HYT TC-610 VHF Owner's Manual page 11

*SK1 (Side Key 1)
Side Key 1 is the programmable key that can be assigned with long press function and short
press function by your dealer. (See Glossary for definitions of short press and long press.)
*SK2 (Side Key 2)
Side Key 2 is the programmable key that can be assigned with long press function and short
press function by your dealer. (See Glossary for definitions of short press and long press.)
*LED indicator
Status of LED indicator and alert tone see table below (See Functions and Settings for the
detailed operations):
Power up in user mode
Low battery alert
Transmitting
Receiving
Scanning
When the radio is turned on, the power up alert tone
is heard.
When the current channel is a blank channel, the
radio sounds Beep tone continuously.
LED flashes red, and a low-pitched tone sounds at
intervals of 10 seconds.
LED glows red when transmitting
When TOT timer expires, the radio sounds Beep tone
continuously.
TOT pre-alert: a Beep is heard.
LED glows green when carrier is present.
Green LED flashes at every 1 second, while scanning
is in process.
Scan Start Alert Tone (programmable by your dealer):
a Beep is heard.
Scan Exit Alert Tone (programmable by your dealer):
a Beep is heard.
Priority Channel Scan Alert Tone (programmable by
your dealer): when scanning, if the current channel is
the priority channel, the radio sounds a Beep.
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TC-610 Owner's Manual