Kenwood ProTalk XLS TK-3130 Instruction Manual page 32

continuously transmit, this feature helps you save on battery
power consumption.
If you continuously transmit for 3 minutes (default value), the
transceiver will stop transmitting and a tone will sound. To
stop the tone, release the PTT switch. You can press the PTT
switch again to resume transmitting.
This transceiver is also equipped with a pre-alert tone
which sounds 10 seconds before the Time-out Timer expires.
This will allow you time to finish your message before the
transceiver automatically stops transmitting.
To change the default value of 3 minutes:
1 Turn the transceiver power OFF.
2 Press and hold the MENU key while turning
the transceiver power ON (for 1 second).
3 Press the ▲ or ▼ key to select "
4 Press the MENU key to select "
(3 minutes) or "
5 Press the PTT, MON, or CAL key to exit
Setting Mode.
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" (10 minutes).
".
"