Apple MD104LL/A, MD101LL/A Understanding Ergonomics, Keyboard and Trackpad, External Mouse, Chair

Hearing damage Permanent hearing loss may occur if earbuds or headphones are used at high volume. You can adapt over time to a higher volume of sound that may sound normal but can be damaging to your hearing.

If you experience ringing in your ears or muffled speech, stop listening and have your hearing checked. The louder the volume, the less time is required before your hearing could be affected. Hearing experts suggest that to protect your hearing:

ÂÂ Limit the amount of time you use earbuds or headphones at high volume.

ÂÂ Avoid turning up the volume to block out noisy surroundings.

ÂÂ Turn the volume down if you can’t hear people speaking near you.

High-risk activities This computer is not intended for use in the operation of nuclear facilities, aircraft navigation or communications systems, air traffic control systems, or for any other uses where a failure of the computer system could lead to death, personal injury, or severe environmental damage.

Operating environment Operating your MacBook Pro outside these ranges may affect performance:

Operating temperature: 50° to 95° F (10° to 35° C)

Storage temperature: -4° to 113° F (-20° to 45° C)

Relative humidity: 5% to 90% (noncondensing)

Operating altitude: 0 to 10,000 feet (0 to 3048 meters)

Carrying your MacBook Pro If you carry your MacBook Pro in a bag or briefcase, make sure that there are no loose items (such as paper clips or coins) that could accidentally get inside the computer through vent openings or get stuck inside a port. Also, keep magnetically sensitive items away from the MagSafe power port.

Using connectors and ports Never force a connector into a port. When connecting a device, make sure the port is free of debris, that the connector matches the port, and that you have positioned the connector correctly in relation to the port.

Handling glass parts Your MacBook Pro contains glass components, including the display and trackpad. If they are damaged, don’t use your MacBook Pro until it has been repaired by an Apple Authorized Service Provider.

Storing your MacBook Pro If you are going to store your MacBook Pro for an extended period of time, keep it in a cool location (ideally, 71° F or 22° C) and discharge the battery to 50 percent. When storing your computer for longer than five months, discharge the battery to approximately 50 percent. To maintain the capacity of the battery, recharge the battery to 50 percent every six months or so.

Cleaning your MacBook Pro When cleaning the outside of your MacBook Pro and its components, first shut down your MacBook Pro, and then unplug the power adapter.

Then dampen the included cleaning cloth to wipe the MacBook Pro exterior. Avoid getting moisture in any

openings. Do not spray liquid directly on the computer. Do not use aerosol sprays, solvents, or abrasives that might damage the finish.

Cleaning the MacBook Pro screen To clean your MacBook Pro screen, first shut down your MacBook Pro and unplug the power adapter. Then dampen the included cleaning cloth with just water and wipe the screen. Do not spray liquid directly on the screen.

Understanding Ergonomics

Here are some tips for setting up a healthy work environment.

Keyboard and Trackpad

When you use the keyboard and trackpad, your shoulders should be relaxed. Your upper arm and forearm should form an angle that is slightly greater than a right angle, with your wrist and hand in roughly a straight line.

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Use a light touch when typing or using the trackpad and keep your hands and fingers relaxed. Avoid rolling your thumbs under your palms.

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Change hand positions often to avoid fatigue. Some computer users might develop discomfort in their hands, wrists, or arms after intensive work without breaks. If you begin to develop chronic pain or discomfort in your hands, wrists, or arms, consult a qualified health specialist.

External Mouse

If you use an external mouse, position the mouse at the same height as the keyboard and within a comfortable reach.

Chair

An adjustable chair that provides firm, comfortable support is best. Adjust the height of the chair so your thighs are horizontal and your feet are flat on the floor. The back of the chair should support your lower back (lumbar region). Follow the manufacturer’s instructions for adjusting the backrest to fit your body properly.