Huawei EchoLife HG520b User Manual page 6

Do not clean the device cover with any cleaning solution or cleanser
spray. Use a piece of soft cloth to clean the device cover.
Wireless Product Usage Requirements
Keep the device away from magnetic storage devices (e.g., a
magnetic card or a floppy disk), to prevent loss of the stored
information.
Stop using the device or disconnect the power supply in situations
where wireless device is prohibited or using of a wireless device
leads to interference or danger.
The user who uses an electronic assistant medical-treatment device
needs to confirm with the service center regarding the effects of the
radio wave on this device.
Do not take the device to the operation theater, Intensive Care Unit
(ICU) or the Coronary Care Unit (CCU).
When using the device maintain distance of 20 cm between your
body and the antenna of the device.
Do not drop, throw or try to bend your wireless device.
Do not place the wireless device and its accessories in high
temperature areas.
Environmental Protection
Do not dispose the abandoned device in a garbage can. You need to dispose it
according to the local regulations on disposing of device packing materials,
exhausted battery and abandoned device, and support the recycling activity.