I purchased The First Years Baby Monitor that has the dual receivers and it's been good to us and has worked great. It has good sound quality and range that is big enough but not so big that we will have the neighbors spying on us. I really appreciate having the dual baby receivers. We keep one of the receivers in the living room that is stationary and the second receiver is one that moves around with us as needed. If I need to be outside, it goes outside with me or if I'm down in the basement it will go with me. That way in case I lose it or misplace it I always know where the other one is. The only issue I have with this item is the batteries tend to drain quickly in the receivers. It doesn't matter if I buy the expensive batteries or the cheap ones, that never last as long as they should. It's as if the receiver is using the battery charge even while it's off. Sound/Video Clarity The sound quality is really strong. You can clearly hear the baby when he's awake and just playing because he doesn't always wake up and cry, sometimes he starts playing and I don't know what kind of trouble he can get himself into and so I like to grab him out as soon as he wakes up so it's helpful to have a crisp clear receiver so I can hear what is going on at all times when he's in his crib. Interference I never have any issues with interference. I do live out in the country and I don't have a lot around me that would cause any interference. Durability I've had my units for a few years and a couple of kids and they work great. The only issue is they use up batteries quickly. Portability They are easy to transport and move around. I can clip it on my belt if I'm cleaning or working in the garage or outside. The range is great and I don't feel comfortable going very far so they cover a range bigger than I am willing to go.