Acer Aspire E1-521 - Manual (Page 9)

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Not carry the device near your pacemaker when the device is switched on.
If you suspect interference, switch off your device, and move it.
Hearing aids. Some digital wireless devices may interfere with some hearing aids. If
interference occurs, consult your service provider.
Vehicles
RF signals may affect improperly installed or inadequately shielded electronic
systems in motor vehicles such as electronic fuel injection systems, electronic anti-
skid (anti-lock) braking systems, electronic speed control systems, and air bag
systems. For more information, check with the manufacturer, or its representative,
of your vehicle or any equipment that has been added. Only qualified personnel
should service the device, or install the device in a vehicle. Faulty installation or
service may be dangerous and may invalidate any warranty that may apply to the
device. Check regularly that all wireless equipment in your vehicle is mounted and
operating properly. Do not store or carry flammable liquids, gases, or explosive
materials in the same compartment as the device, its parts, or enhancements. For
vehicles equipped with an air bag, remember that air bags inflate with great force.
Do not place objects, including installed or portable wireless equipment in the area
over the air bag or in the air bag deployment area. If in-vehicle wireless equipment
is improperly installed, and the air bag inflates, serious injury could result. Using
your device while flying in aircraft is prohibited. Switch off your device before
boarding an aircraft. The use of wireless teledevices in an aircraft may be
dangerous to the operation of the aircraft, disrupt the wireless telephone network,
and may be illegal.
Potentially explosive environments
Switch off your device when in any area with a potentially explosive atmosphere
and obey all signs and instructions. Potentially explosive atmospheres include
areas where you would normally be advised to turn off your vehicle engine. Sparks
in such areas could cause an explosion or fire resulting in bodily injury or even
death. Switch off the device at refueling points such as near gas pumps at service
stations. Observe restrictions on the use of radio equipment in fuel depots, storage,
and distribution areas; chemical plants; or where blasting operations are in
progress. Areas with a potentially explosive atmosphere are often, but not always,
clearly marked. They include below deck on boats, chemical transfer or storage
facilities, vehicles using liquefied petroleum gas (such as propane or butane), and
areas where the air contains chemicals or particles such as grain, dust or metal
powders. Do not switch the notebook on when wireless phone use is prohibited or
when it may cause interference or danger.