Yes our WiFi extenders are universally compatible with WiFi routers. Regards, TP-Link Support
I don't think it will help. N300 Universal Wi-Fi Range Extender only works for WiFi.
Yes, you can, so long as you do not exceed the outlet's maximum wattage load.
I don't know about spectrum internet, i am using CenturyLink. My CenturyLink modem is is my computer room. i am using N300 outside in my motorcycles garage which is about 25 to 30 feet in door and i don't have any problems with it.
Yes the product is compatible with netgear and vast majority of routers and if you cannot connect via wps it has its own standalone setup so you can manually connect this product over Wi-Fi.
internet service provider does not matter. It is compatible with most routers.
20 feet or so from what I can tell
This will not work to enhance satellite signals. It can be used to enhance Wi-Fi signals provided by a router.
No smart phone needed.