Operating Environment; Preventing Hearing Damage - Huawei C3100 User Manual

Operating Environment

Do not use or charge the device in dusty, damp or dirty places or
places with magnetic fields. Otherwise, the circuit may not
function properly.
The device complies with the RF specifications when the device
is used near your ear or at a distance of 1.5 cm from your body.
Ensure that the device accessories such as a device case and a
device holster are not composed of metal components. Keep your
device 1.5 cm away from your body to meet the requirement
earlier mentioned.
On a thunder and stormy day, do not use your device when it is
being charged, to prevent any danger caused by lightning.
When you are on a call, do not touch the antenna. Touching the
antenna affects the call quality and results in increase in power
consumption. As a result, the talk time and standby time are
reduced.
While using the device, observe the local laws and regulations,
and respect others' privacy and legal rights.
Use accessories authorized by manufacturers. Using unauthorized
accessories will render the warranty null and void.
Keep the ambient temperature between 0℃ and 45℃ while the
device is being charged. Keep the ambient temperature between
-20℃ to 60℃ for using the device powered by battery.

Preventing Hearing Damage

Using the receiver, earbuds, headphones, speakerphone, or earpieces
at high volume can result in permanent hearing loss. Be extremely
careful when listening at high decibel levels. Set the volume to a safe
level. If you experience strange sounds in your ears like ringing or if
you hear muffled speech, get your hearing checked. If you continue
to use high volume, your hearing will soon get affected.
Hearing experts offer the following suggestions to protect your
hearing:
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