The Emotion Cube is a cube that is grey with a speaker on the bottom. You only need it if you have a Companion cube. You place it into the middle of your house's roof or a room's celing and if a companion cube is in the room or house it will translate what it is saying. Example: The companion cube wants to play or the companion cube wants to rest. It is very useful to the humans. You do not need a speaker on the sides or the top because that part is in the wall.