Neurowear: Ears and a tail react to how you feel
Japan would’ve come up with this eventually. These are a little freaky but pretty cool at the same time. It could give an awesome touch to some costumes for a party or something. For it to understand your mood, it requires a headset and Bluetooth to connect to an app that figures out if your sad, happy, excited, etc. Check out their official website here and you can actually buy a pair of ears here.