You may have seen some concepts before, but Taily, is a real robotic tail that wags when you get excited, or based on your heartbeat. That’s right, it “knows when a person is excited by measuring their heart rate using sensors padded along the inside of its belt. Tailly wags when a person’s heart rate increases and sags when their heart rate drops.” Continue reading for a video and more information.

Here’s what its creator, Shota Ishiwatari, has to say: “Tailly is not just a toy, nor is it a fashion accessory or a gadget. It is those three items combined, and, since it reacts to the heart beat rate, an extension of the users’ body. Tailly is fun to wear to parties, while out with friends or playing with kids.”