Material features: The product is made of imported thermoplastic elastomer mixed rubber material and imported PVc plastic, made of stainless steel mold and injected by injection molding machine at high temperature. It has accurate anatomical marks, real feel, and no deformation after disinfection and cleaning. Electronic alarm - During the training of oral and nasal tracheal intubation, improper operation may cause the laryngoscope to squeeze the teeth or insert it into the esophagus, and it has an electronic alarm function. (Battery not included) When conducting training operations for oral and nasal tracheal intubation, correct operation to insert the airway has a side visual function; air supply makes the lungs expand, and air is injected into the tube balloon to fix the tube. When conducting training operations for oral and nasal tracheal intubation, incorrect operation to insert the esophagus has a side visual function. Air supply makes the stomach expand. When conducting training operations for oral and nasal tracheal intubation, incorrect operation causes the laryngoscope to cause teeth to be compressed, and there is an electronic alarm function.