Install the included rubber antenna onto the radio.
The PRO401HH can also use any type of 50 Ω / 27 MHz band
antenna. Although a telescoping antenna might provide better
transmission and receiving, it is not as compact or easy to use as
the antenna included in the package.
CONNECTING TO POWER
Your PRO401HH can operate on DC power or batteries.
Plug DC power cable into the PRO401HH.
Plug the other end into your vehicle's cigarette lighter/DC power
The red power LED is steady on when the unit is connected to
external power (not batteries).
You can use either 9 non-rechargeable alkaline batteries or 9
rechargeable Ni-MH batteries with this unit.
Open battery cover.
Set the internal switch to match the battery type you are using
[either alkaline or rechargeable (Ni-MH) batteries].
Insert the 9 batteries according to the directions indicated inside
the battery compartment.
Close battery cover.
The LED display turns off after 1.5 seconds to conserve battery power.