[Functions] Equipped with video view, call, warning notification, door unlock, and other convenient intercom functions. Can be used from the bedroom, kitchen, toilet, or veranda anywhere with Wi-Fi coverage in the home, and can be used from outside with 4G lines. Also, visitor recordings can be checked outside in case of the apartment system.（paid service） Visitor recordings (video only) can be checked outside in case of the individual house system. [Concerning usage] ・This is an exclusive appl