Tenda A301 User Manual page 18

Signal strength
Signal strength LED indicator color
0% Off
1% to 37% Red
38% to 100% Blue
Description
Fail to extend.
Extended, but the extender is a little far away from your router.
relocating
You can try it closer to the router to get better connection
quality.
Extended, and the connection quality is good.
You can move the extender a little far away from your existing router to
get wider WiFi coverage.
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