Yes it's wireless. Wired isn't really an option as digging through the stone exterior walls would be a major hassle. In any case I did some research and found this transmitter and receiver: http://www.amazon.com/gp/product/B00C10T1JS/ref=oh_details_o00_s00_i00?ie=UTF8&psc=1

http://www.amazon.com/gp/product/B00436ZFRA/ref=oh_details_o00_s00_i01?ie=UTF8&psc=1

2500 foot range (even when drastically reduced due to steel/stone, it has a much better chance of going through than one with just a 60 or 150 foot range), and came recommended to me when I called the manufacturer up. Fingers crossed on this one.