Safety Requirement - TTI TCB-881 Manual De Uso

12. Safety Requirement

The power cable is for 12V/24V DC only. Be sure the transceiver
is off before connecting the leads of the power cable to the
power supply. It is important to observe the polarity even if the
unit is protected against the accidental inversion :
* Red : Positive pole (+)
* Black : Negative pole (-)
The same colors are present on the battery and in the fuse box
of the car.
The unit must be wired for the negative ground only.
To avoid damage, do not operate your CB radio without
connecting a proper antenna.
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TCB-881