Mitel Superset 4150 - Manual (Page 7)

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TIPS FOR YOUR COMFORT AND SAFETY
Don't cradle the handset!
Prolonged use of the handset can lead to neck, shoulder, or back discomfort,
especially if you cradle the handset between your ear and shoulder. If you
use your phone a lot, you may find it more comfortable to use a headset.
See the section on headset usage elsewhere in this guide for more
information.
Protect your hearing
Your phone has a control for adjusting the volume of the handset receiver or
headset. Because continuous exposure to loud sounds can contribute to
hearing loss, keep the volume at a moderate level.
Adjusting the viewing angle
The stand built into your phone tilts to give you a better view of the keys.
To tilt your telephone for better viewing:
1. Press the tilt-release paddle on the telephone base.
2. Tilt your telephone to the desired angle.
3. Release the tilt-release paddle.