This baby monitor I can only recommend. It is small and unobtrusive, simple but beautifully timeless. We do not need video surveillance, but a way to listen to our children in an emergency, because we sleep two floors below them. The baby monitor is in the hallway, but I can hear coughing children, for example, if your door is open a crack. That is enough for us completely, because our children no longer are small already. I have the device available on my bedside table and was initially skeptical of the radio waves, but this concern was absolutely groundless. The baby monitor turns on only one when it transmits noise and is otherwise 100% silently and smoothly. The two floors are irrelevant, the device transmits all problems. It is easy to use and has no frills.