This single headed stethoscope really works! It is safe and durable and can be used by young children in imaginative role playing and by older children to conduct scientific experiments! For ages 3+ WonderStuff is designed to take you to a place where curiosity and fascination collide with the imagination. Marvel at the worlds of science, technology and nature. Be amazed as you play and discover. This toy is safety and quality tested and we guarantee that we’ve put it together using only the stuff of wonder! WonderStuff toys are available only at Kidstuff.