There are some households within the country that don’t have door chimes, whether this be the want for a traditional door knocker or perhaps adding this to your home may not match what is classed as an essential item for your needs.
If you don’t want a door chime then this will not be a matter of life or death but it can prove useful. For example, if you are in the garden then a standard door knocker may not be heard but you couldn’t miss the sound of a wireless chime designed to be heard throughout an entire house.