I haven't used it outside the house (e.g. to go upstairs), but inside the house, which is 90 square meters, it has a very good signal, clear (relatively) picture, and very good sound (you can still hear it even if the baby changes sides).
I can't say that the battery lasts very long, but it doesn't bother me because I have the charger available at all times since I'm at home.
I recommend it.

I read in other comments that it doesn't pick up small sounds. They probably haven't set the settings correctly because it even picks up the sound of our dog's nails when he walks or the little machines passing by outside. Indeed, the battery in the parent unit runs out quickly, but it's not a problem.

The device unfortunately is not worth its money. It never captures the baby's normal sounds, only loud crying. Almost always, the baby's sound is heard first from the room and then from the device, given that our room is next to it. The battery lasts very little when not plugged in. The only good thing is the camera that allows you to see the baby from afar without going to their crib.

Bad experience with this specific product. 1. The camera DOES NOT have a battery, it needs to be constantly plugged in. 2. The monitor does not hold a charge for more than 1-1.30 hours. 3. It does not open with the baby's movement, only with sound. 4. Even so, it does not open with low sounds, but only when the baby cries loudly. On the positive side, it has good sound and good image quality, but it is very expensive for all these features. Look for something else

Very good image, very good range. It has never lost its signal. The battery does indeed drain in two to three hours, but that is not a problem. I highly recommend it. It is very good for the money.

Unfortunately, I have not been satisfied with the purchase of the camera. It does not have a very good range and the battery drains with the first use. It needs to be constantly charged. It is not worth it at all, very expensive for what it offers.