A doorbell is an electrical device that is used to signal to the occupants of a house or building that someone is at the door. It typically consists of a button or switch on the outside of the door, and a chime or bell inside the house that is activated when the button is pressed.
Doorbells can come in various styles and designs, from simple push-button models to more advanced wireless and smart doorbells that can be controlled and monitored through a mobile app. Some models may also have features like video cameras, intercoms, or motion sensors.Doorbell systems can be wired or wireless, and may require professional installation depending on the complexity of the system. Wired doorbells are connected to the electrical wiring of the house, while wireless doorbells use radio signals to communicate between the button and chime.