While this feature is not available in every random baby monitor, the visual sound bar lights can work a long way when not sure what to do. According to some baby monitor reviews, this feature allows you to determine the volume of your baby’s cries. The lights can also be used independently while turning the actual sound notifications off. This way, the baby monitor will not activate by itself if you watch TV or you vacuum. Make sure that you read more reviews upfront. How do they work at night? If they are too light, every random noise can seriously affect your sleep.