Billion M500 - Chapter 2: Product Overview; Important Note for Using this Router

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Chapter 2: Product Overview
Important Note for Using This Router
 Do not use the router in high humidity or high temperature.
 Do not open or repair the case yourself. If the device becomes
too hot, turn off the power immediately and have it repaired at
a qualified service center.
 Avoid using this product and all accessories outdoors.
Warning