Huawei Consumer Cellular Envoy User Manual page 23

Do not place the device over the air bag or in the air

bag deployment area in a motor vehicle. Doing so may
hurt you because of the strong force when the air bag
inflates.
Do not use your device while flying in an aircraft or

immediately before boarding. Using wireless devices in
an aircraft may disrupt wireless networks, present a
hazard to aircraft operation, or be illegal.
Operating environment
Avoid dusty, damp, or dirty environments. Avoid

magnetic fields. Using the device in these
environments may result in circuit malfunctions.
Do not use your device during thunderstorms to

protect your device against any danger caused by
lightning.
Ideal operating temperatures are 0°C to 35°C. Ideal

storage temperatures are -20°C to 70°C. Extreme heat
or cold may damage your device or accessories.
Do not expose your device to direct sunlight (such as

on a car dashboard) for prolonged periods.
To protect your device or accessories from fire or

electrical shock hazards, avoid rain and moisture.
Keep the device away from sources of heat and fire,

such as a heater, microwave oven, stove, water heater,
radiator, or candle.
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