Oregon Scientific PMR RADIO TRANSCEIVER TP380 - Manual (Page 8)

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5. Press and hold to turn on the device. The unit will beep with the
LCD displaying all symbols for 1 second.
6. Use or to increase or decrease volume, respectively. The VOL
number will show on the LCD accordingly.
7. To turn the device off, press and hold until the unit beeps and
the LCD goes blank.
BASIC FUNCTIONS
NOTE: The battery indicator will flash to indicate low battery power.
PWR
PWR
EN