Alinco DJ-100 - Manual (Page 69)

Professional
FM Transceiver 52
RECOMMENDED INSTALLATION OF EARPHONE MICROPHONE
Earphone
Use a clip to fix with collar.
Clip the PTT unit closer to your mouth.
Carry the radio on the side or the back of your body,
and the cable should go around the back as shown.
Clamp the excessive length of cable at your waist