3. Most smart doorbells will let you see and talk to anyone who rings your door, even if you’re not home. This could help deter would be burglars by tipping them off that you might actually be at home, even if you’re really not. Additional features, such as wide angle viewing, can help you keep an eye on the area surrounding your door, so you can make sure no one is sneaking up to steal packages or look in your windows. A doorbell is useful to prevent the entry of an unknown person to your home, office, apartment, building, etc. The use of traditional doorbell is gradually declining because of its limited functionalities.