I got these from my daughters fathers mother when she was about a month old. I didn't use them at first since I was in a single story home with her room connected directly to the living room. But, ever since she started making visists to my dads house these things have been an invaluable addition to her baby room. They have a light on the "monitor" part that you leave in the room with her and two additional "paren't moitors" which you can carry with you up to 2500 feet. And, it does in fact go that distance. Her room is upstairs and we would be down in the back yard and it would still pick up a clear signal. Clear enough that I could hear her breathing and the monitor was on the dresser about 3-4 feet from where she was sleeping. I like that it has a intercom button. You can speak to your child or your partner while they are in the room if you need to. It also has a button which you can use as a night light and the volume buttons are wonderful. Turn it down low while you are just relaxing and can hear it or turn it up when you are watching a movie and you can hear through it. I loved mine. I am actually saving them for when the next one, if the next one, comes around.