What are the safe operating temperature and installation requirements for the RE220?
The operating temperature should be between 0°C and 40°C (32°F – 104°F). For safety, the extender should only be plugged in upright directions as shown in the manual. Additionally, keep the device away from water, fire, humidity, or hot environments. (Page 6)
From the official TP Link Re220 Range Extender manual, page 6
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