This is tiny, non-intrusive, and worth every penny. Its small enough to travel with the baby so I send it with her to the sitter. It has misfired a few times, but it has also gone off for real a couple of times too, or so we suspect. The alarm had sounded, we rushed to check on her and she was not moving, not stirring from the alarm, and it was snugly on her diaper right where it should be. After that happened a couple of times, I decided that I would have paid three times as much for this moniter because it has done exactly what it is meant to do. I don't even want to think about what could have happened if I didn't own this little thing. Even if does misfire, a false alarm is better than no alarm. Do yourself a favor, buy this little diaper moniter and rest a whole lot easier.