If you want to show your emotions, you can yell, cry, or smile. However if you’re too shy to let your facial expressions reveal how you’re feeling, you might consider buying the Necomimi brainwave transmitter instead. This device rests on your head and detects your mood through sensors pressed against the side of your head.
If you’re concentrating on something, the ears perk up. If you’re relaxed, the cat ears drop down. By letting someone see your cat ears express your emotions, you can show off your emotional state for others to interpret, just like trying to read the emotional state of a real cat.