Panasonic TV doorphone, 2022 model, defective. Please consider this as a defective item or junk item. Purchased in 2023 for expansion, but installation was abandoned due to issues with the existing wiring, so I am putting it up for sale. Even when powered on, only the notification lamp lights up blue and blinks red. Since it was only installed for a few hours, the main unit is relatively clean. Simple packaging. Please use it for parts.