try to set a fixed wireless channel on your wireless router. The recommanded channel is 1/6/11.

no idea about this~ You'd better email to tp-link support for details~

we can detect wireless network from extender even there is no internet connection. that does't mean the extender is set successfully. on that extender, is RE light on or off? On the status of the web...

it seems that TL-WA850RE hasn't been configured successfully because the RE light is off. You may login to the web page to install it manually.

what's the OS of your computer? go to the link to download the driver firstly: http://www.tp-link.com/en/support/download/?model=TL-WN881ND&version=V1#tbl_a then, refer to the following link to...

one TL-WA801ND (A) works as access point placed ground floor and the other (B) works as repeater placed top floor. Internet ----port of TL-WA801ND (A) ) ) ) ) ) ( ( ( ( TL-WA801ND (B) ? what's the...