Hytera TF-515 - Low Battery Alert; Time-Out Timer (TOT); Auto Squelch

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7.14 Low Battery Alert
When the radio is low on power, flashes on the screen and an alert tone rings when you press the PTT key,
indicating that the radio enters the low battery alert mode. In this mode, you are not allowed to send a call tone or
initiate a call.
To exit this mode, charge or replace the battery.
7.15 Time-out Timer (TOT)
The purpose of TOT is to prevent any user from occupying a channel for more than 60 seconds. After 60 seconds,
the radio stops transmitting and keeps beeping. To stop beeping, release the PTT key.
7.16 Auto Squelch
The Auto Squelch feature allows the radio to improve voice clarity during the call by automatically removing
background noise.