inputs.text: used years best investment ever - came back order another one using thehem years go barn house couple hundred feet away units worked flawlessly huge time saver leave thehem times full volume case need used course plugged no need deal batteries constant maintenance occasionally someone miles away break channel frequency kind funny actually make jump happen near intercom weird noises come years thehem probably happened 3 times made sure picked obscure channel frequency many choose easy find one no one using bottom line highly recommend units purchased another intercomm systehem another brand previous hard set one receiver quit working within week returned dakota brand widely known one reliable systehems definitely proved household