HP Vectra VLi8 User Manual page 64

WARNING FOR
HEADPHONES &
SPEAKERS
4 Working in Comfort
If you use your thumb to rotate the ball on a trackball or spaceball,
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keep it in a relaxed, natural shape, and maintain a neutral posture in
your hand, wrist and forearm.
Hold the mouse gently by draping your fingers over it. Keep your
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hand relaxed and fingers loose. Do not grip the mouse tightly.
It takes very little pressure or force from your fingers to activate the
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buttons or scroll wheel on your mouse, scrolling mouse, trackball or
other input device. Using too much force can place unnecessary
stress on the tendons and muscles in your hands, wrists and
forearms.
If you are using a scrolling mouse, be sure to keep your fingers and
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hand in a relaxed, neutral position when activating the scroll wheel.
Also, this type of mouse features software that can minimize the
number of mouse movements or button clicks.
When using a mouse, trackball, stylus and graphics tablet, or other
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input device, position it as close to the keyboard as possible, and
keep it at the same level so you do not have to stretch while using it.
Use a good quality mouse pad to enable the mouse to work most
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effectively and reduce unnecessary hand and wrist movements.
Be sure to keep your mouse and trackball clean. Regular removal of
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accumulated dust and dirt helps ensure proper tracking and reduces
unnecessary hand and wrist motions.
If your PC is multimedia or if you add a sound card to your PC,
always turn the volume down before connecting headphones
or speakers, to avoid discomfort from unexpected noise or
static. Listening to loud sounds for prolonged periods of time
may permanently damage your hearing. Before putting on
headphones, place them around your neck and turn the
volume down. When you put on the headphones, slowly
increase the volume until you find a comfortable listening
level. When you can hear comfortably and clearly, without
distortion, leave the volume control in that position.
60 English