Switch On/Off; Basic Operation; Volume Adjustment - Klein Blackbox+ series User Manual

Basic Operation

Switch ON/OFF

Switch on the radio by turning the Power/Volume switch clockwise until a click is felt. At the same time, a voice
indication of the current channel is heard.
To switch off the radio, turn the Power/Volume switch counter clockwise until a click is felt.

Volume Adjustment

Rotate the Power/Volume switch to adjust volume when the radio is turned on.
Channel Selecting
Rotate the channel knob to select operating channel from 1~15+S, according to the numbers or symbols on the
bottom of Channel Knob or channel annunciation.
Make a Call
Press and hold PTT button, then speak into the microphone with normal voice. Please keep your mouth 2-6 inches
from the front of the radio.
Note: 1. Press PTT button and indicator lights red, the radio begins to transmit.
2. When indicators flashes red, it means the battery voltage is low. The radio can not transmit.
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