Sound devices relay what is happening in baby's room via sound only. A great sound option is quiet unless the baby is making noise so that you won't be disturbed by white noise or constant static. This basic monitoring type can be all you need if your goal is being alerted when your baby is crying and needs your assistance. This style can be elementary with sound only like the V-Tech DM111 or it can have bells and whistles like a nightlight, 2-way talk, lullabies, and mic sensitivity adjustment features like the Philips Avent DECT SCD570/10. Most parents can get by with a sound only device as it provides the information you need to determine if your baby needs you or not.
Most dual monitors come with split- or even quad-screen viewing, and the DBPower Digital Sound Activated baby monitor does just that. This model supports up to four cameras, allowing you to monitor four rooms at once. With features like remote pan/tilt/zoom, room temperature monitoring and alert, two-way communication and manual or automatic video recording, we found the DBPower to be the best dual baby monitor.