When user A is ready for a talk, they can use a switch to turn on their availability mode, which will light up the other party’s device (interior light is on) and trigger the movement of the house figurine. The roof light on user A’s device will blink several times, indicating that the availability mode turns on. Once user B sees that user A is available, they can decide if they want to initiate a synchronous check-in with user A.

The availability mode will automatically turn off after a specific period, such as 30mins or one hour etc. When time runs out, the interior light in user B’s device will gradually fade to dark while the house character slowly moves down until it disappears in the window. User A can use the switch to turn off availability mode as well.

There are four states regarding the interactions between two devices: