AT&T TL7610 User Manual page 26

Getting started
Headset attachments
Behind-the-neckband
3. Push the earpiece towards the neckband ring until it clicks into
place as shown in Figure 3.
4. Place the neckband around your neck and over your ears.
5. Adjust and rotate the angle of the headset until the microphone is
pointing toward your mouth as shown in Figure 4.
Figure 3
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Figure 4