Output power of Amped Wireless AC Range Extender vs Wireless AC Routers in general

I have a question, I noticed that amped wireless with their wireless AC range extenders claims output power of up to 800mW/12,000 sq ft coverage on the RE1750A AC1750 range extender or up 800mW/14,000 sq ft coverage on the RE1900A Titan-EX. What are the actual output power and coverage of say the Netgear R7000 and ASUS RT68U/R Wireless AC routers since it seems like the wireless extenders sound powerful, not so sure how it performs in reality. I just noticed routers can act as a router,...

Output power of Amped Wireless AC Range Extender vs Wireless AC Routers in general