What do the different Signal LED colors mean on the RE220?
A solid green Signal LED means the extender is connected to your router's wireless network and is in a suitable location. A solid red Signal LED means the extender is experiencing poor signal strength and you should try relocating it closer to your host router. If the Signal LED is off, no wireless connection has been established. (Page 4)
From the official TP Link Re220 Range Extender manual, page 4
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