Chalice-shaped chest piece featuring dual-frequency diaphragms on both its sides. Offers perfect acoustic performance, diagnostic versatility and ease in the handling of patients of various body types and ages. Better audibility of high-frequency sounds to help learn about patient's condition. Paediatric side converts to an open bell which stays clear of dirt and debris by covering it with the small diaphragm. Dual-lumen tubing combines 2 sound paths in 1 tube, eliminating the rubbing noise of traditional double tubes. No natural rubber latex or phthalate plasticisers are used in the tubing or any other component.