Baby monitor from your smartphones. It is enough to be in the same Wi-Fi network and be able to monitor your sleeping child.
Baby monitor will allow you to go about their business, and hear what happens to your child. You don't need anything except your smartphones.
Turn on one smartphone parent mode, the second mode of the child, as a result of the child's device will receive sound on the device of the parent.
Baby monitor can free you from the constant monitoring of the child, you can go about their business, and the radio nanny will monitor your child,
as soon as she hears the sound of your baby, she'll let you know.