Zte V66 User Manual page 105

 Do not grip the device too tightly.
 Press the icons and touch screen lightly.
 Use the special features which are designed to minimize the times of
pressing the icons and touch screen buttons, such as Message
Templates and Predictive Text.
 Take lots of breaks to stretch and relax.
Loud Noise
This device is capable of producing loud noises which may damage your
hearing.
MP3 and video player function
When listening to pre-recorded music or watching videos on your device,
with headphones or earphones at high volumes, you run the risk of
permanent damage to your hearing. Even if you are used to listening to
music at a high volume and it seems acceptable to you, you still risk
damaging your hearing. Reduce the sound volume to a reasonable level
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