Hi,

the wifi coverage area of the A7 is about 10-15 meters. While it depends on the actual network environment; including distance, obstacles, other wireless devices. 

While we can change some wireless settings, like wireless channel and channel width to improve its performance. 

You can refer to the instructions below:

http://www.tp-link.com/us/faq-468.html
http://www.tp-link.com/us/faq-469.html

May it help.

Good day.