ZTE Blade 3 - Manual (Page 171)

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Loud Noise
This phone is capable of producing loud noises, which may
damage your hearing. Turn down the volume before using head-
phones, Bluetooth stereo headsets or other audio devices.
Phone Heating
Your phone may become warm during charging and during nor-
mal use.
Electrical Safety
Accessories
Use only approved accessories.
Do not connect with incompatible products or accessories.
Take care not to touch or allow metal objects, such as coins or
key rings, to contact or short-circuit in the battery terminals.
Connection to a Car
Seek professional advice when connecting a phone interface to
the vehicle electrical system.
Faulty and Damaged Products
Do not attempt to disassemble the phone or its accessory.
Only qualified personnel can service or repair the phone or its
accessory.