Mechanical doorbells have lots of history with their invention back to the 18th or early 19th century. These early systems operated without electricity and relying on chains levers or knobs to trigger a bell inside the house. This simple design was an effective way to announce visitors. In the ...

Wireless doorbells started in the 1930s. A company called Nutone made the first one. It used radio waves to send a signal from the button to the bell. It did not need wires so it was easy to set up. The first versions had weak signals and short range. Even with problems they helped start new ideas ...

The Google Nest Doorbell came out in 2018 and changed home security with smart video features. It worked with the Nest system and let people see who was at the door through their phones. Over time the doorbell got better with updates like clearer video and better motion detection. The app also ...