The yellow headphones have an outline of Pikachu on the back, and the charging case features a front button that lights up to show battery level and a wrist strap for carrying. Engadget notes the earbuds are essentially the, just stylized (and cuter). A single charge will give you about three hours of life, and the case can recharge the earbuds about five times.
Unfortunately, the Pikachu earbuds will only be available in China. They'll sell for around $120 starting April 16.