US Patent 9635322 Video intercom device

Provided is a video intercom device suppressing electric power consumption. The video intercom device adopts a configuration where the video intercom device performs wireless communication between a front door slave unit and an indoor master unit, the indoor master unit includes a wireless communication unit that requests the front door slave unit to be switched between a first communication method by which the front door slave unit periodically turns on a main power source and is in a sleep state when the main power source turns off, and a second communication method by which the front door slave unit turns on the main power source when an interrupt occurs and is in the sleep state when the main power source turns off, and the front door slave unit includes a controller that controls switching to a communication method requested from the indoor master unit.