The principle of the smart doorbell is great. However, Digitec should point out that the doorbell only works smart with certain "gongs", see here Compatible gongs https://helpcenter.netatmo.com/de/smarte-videoturklingel/top/welche-gongs-sind-mit-der-smarte-videoturklingel-kompatibel I think the product can be sold even better if you make a bundle.