Warnings in the Android's Mobile Phone and Device Manual

Notes:
+ Do not use a screen protector because this causes sensor malfunctions.
+ Do not allow water to contact the touch screen. The touch screen may malfunction in humid conditions or when exposed to water.
+ Do not use your device while it is charging. Doing so may cause electric shock.
+ To lower your risk of hearing damage, do not listen at high volumes for long periods of time.