The product that we thought of was the Loneliness Killer, so obviously the topic we focus on would be devices that enble people to communicate better. The target users would be lonely lodgers, because it sometimes happens that people would be alone when others, who rent the same accommodation, are not there, and such loneliness was so depressing, which triggered us that we should use make something to kill such loneliness. 

Stranger Things, Season 4 (Duffer, M. & Duffer, R., 2022)

When one puts her hand on the heart beat sensor of the Killer hither, the other Killer would start reacting as that the light and the buzzer would glow and buzz with her heart beat, and she can press the buttons to choose which words to send to the other Killer, during which, if there happens to be someone with that other Killer she could react with the remote her in the same manner, so they can hear each other’s heart beat and receiving some simple messages from one another, as the warmth of company could be felt beyond words.