Uniden UH-056 - Manual (Page 16)

Low Battery Level Detection
Uniden Siindowner UH-056 has a built-in battery level
detector circuit. It evaluates your Battery Pack everytime
you transmit to determine whether the power inside the
Battery is still sufficient enough to support normal Receive
and Transmit communications.
The circuit will inform you in two ways.
1, When the PIT switch is pressed and the TX LED blink;
It means the battery level is already low and needs
recharging. You can still transmit, however, you must
finish the conversation and have your battery charged
fully to resume normal operation.
2. When the Blinking TX LED went unnoticed and the
Battery goes down to where normal communication car
no longer be supported, the circuit will disable the PTT
switch and emit an error tone everytime you try to
transmit.
UH-056 Page 14