Experts agree that when you’re buying a baby monitor look for the following: Choose a model with a frequency of 900 MHz or higher. Find a model with a prominent "low-battery" light. Look for a model with a sound-activated light. Go wireless. And make sure you buy a video monitor. With these models you can tell at a glance that baby's still sleeping peacefully. Check for sufficient low-light quality of the picture. Every one of our monitors meets these criteria and much, much more.