Motorola MDJMMN4066 Manual page 4

Receiving
When the headset is connected to the radio accessory
connector, the radio's speaker is muted, and the audio is
only heard from the headset speaker.
Transmitting
When using the MDJMMN4066_ Lightweight Headset
(with in-line PTT), push the PTT switch on the cable to
transmit.
Removing the Headset
Turn the radio off before removing the headset from the
radio side connector. Remember to reattach the radio side
connector cover when an accessory is not being used.
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