Sputnik makes any home smart and any yard safe. The Sputnik: Smart Home(Envoi) app allows you to: - see what's going on in your yard; - receive calls from the intercom wherever you are; - open the door with one click. Please make sure you've paid service fee to your provider to use the basic app functions. You may also buy a suscription to use additional smart functions. Premium subscription expands the intercom functions: - archive of video recordings from the intercom; - temporary access codes for couriers, relatives and friends; - facial recognition for entry into the building, without a key or code