There are two basic types: audio and video/audio. Some are analog, others are digital. All monitors operate within a selected radio frequency band to send sound from a baby's room to a receiver in another room. Each monitor consists of a transmitter (the child/nursery unit) and one or more receivers. Prices range from about $25 to $150 for audio monitors and about $80 to $300 for audio/video monitors.
The American Academy of Pediatrics (AAP) continues to warn parents against using wearable monitors on infants to track breathing and vital signs — as they aren’t FDA approved and don’t always provide the most accurate results. The caution has led to the advent of non-contact breathing monitors like Cocoon Cam Plus. It’s a ‘smart’ Wi-Fi baby monitor that not only lets parents watch live 720p high-def footage of their baby snoozing, but also track their real-time breathing, movements, and sleep patterns using computer vision and artificial intelligence. And it can do both from either above the crib or across the room, without requiring the child to wear any additional gadgets.
The Levana Lila video product is a dedicated camera and parent unit which means you don't need to tie up your personal device or use the internet. This option is user-friendly and has a respectable range that could work for most average size homes. The Lila has long-lasting battery life and a reasonable price with fewer features than much of the competition, but that is part of what makes it easy enough for grandma to use.
As with any internet-connected device that watches or listens to your home, it's not out of the ordinary to be somewhat wary of a smart baby monitor. All Internet of Things (IoT) devices are potential soft spots for hackers to monitor you. Anything you network can possibly be compromised, and while you shouldn't be afraid of an epidemic of camera breaches, you should always weigh the convenience of these devices against the risk of someone getting control of the feed.