Maxcom MM821BB Manual page 45

• Please keep the mobile phone away from high temperature.
High temperature may shorten the using time, damage the
battery and distort or melt plastic components.
• Please keep the mobile phone away from low temperature.
The circuit may be damaged by the sharp change of
temperature.
• Please operate the mobile phone according to the requests
of user manual.
• Please avoid dropping, knocking and shaking the mobile
phone.
• Do not use liquid or wet cloth with strong cleanser to clean
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