In an innovative way, the product solves the problem of uneven light of thumb that has not been solved in the use of existing products. It also innovated the way it was used. The design of the shape is designed for the thumb, and the internal change of the lighting position ensures that each finger is evenly heated during use. The use method realizes the timing through the touch sensing, replacing the use of the input value of the existing product. With the lovely round shape to increase the interaction between the characters. Increase the interest of the product.