I got me some Necomimi ears
They are quite responsive to your brainwaves sometimes a little too responsive especially you think too much or have overactive brainwaves, the downsides are the cost ($111-$250 depending on where you get them, if you get them online expect to pay $200 minimum not including forwarding service fees, you'll need one because no one selling them online ships them outside of Japan normally, and if you are lucky to go to a convention that sells them, $160 and they take 4 AAA batteries which only last 4 hours.
Now if they can make a tail that moves.
They are quite responsive to your brainwaves sometimes a little too responsive especially you think too much or have overactive brainwaves, the downsides are the cost ($111-$250 depending on where you get them, if you get them online expect to pay $200 minimum not including forwarding service fees, you'll need one because no one selling them online ships them outside of Japan normally, and if you are lucky to go to a convention that sells them, $160 and they take 4 AAA batteries which only last 4 hours.
Now if they can make a tail that moves.
