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Fact #1. These systems are made up of two simple components. The first is the camera, which transmits. The other is the receiver, which displays. Some cameras only pick up radiant light in the spectrum already visible to the human eye. They tend to have slightly better light collection from the quality of the lens and sensor. Others can see into the infrared spectrum, so anything going on in the dark is fully visible.
Fact #2. Old models transmitted via radio frequencies. The odds of one of those signals being intercepted are higher than you'd expect. Newer systems operate on your wireless network's frequency. This is similar in range to the frequencies that are more susceptible to tinkering and hackers. There's one major difference, however. Your wireless network can be password protected.
Fact #3. The case of the Lindbergh baby is a gruesome one. A child was abducted in New Jersey and held for ransom in 1932. The ransom was paid. Unfortunately, a little more than two months after the kidnapping the body of the boy was found. There were serious consequences. It forced US Congress to make kidnapping a federal crime. Plus, the ensuing press coverage of the case's primary suspect sent shock waves of fear through a nation of parents.
Fact #4. The Lindbergh case had another consequence. A few years after it, the Zenith corporation introduced the first baby monitor to the marketplace. They called it the Radio Nurse. Many of the early monitors had a surprising amount of features. They would disappear from the monitors of the 60s, 70s, and 80s. Only to be reintroduced to the market in recent models.
Fact #5. Some studies suggest that screens aren't good for babies. If you follow those ideas, you might want a system that links to your smartphone. That will avoid adding yet another monitor screen.