1.Equipped with cuff pilot, able to observe the pressure inside the cuff at any time.

2. Can be intubated, can be under the fiberscope.

3. Built-in air pressure balance lumen, balancing the air pressure inside the stomach.

4. Built-in buffer lumen, preventing reflux mis-aspiration.

5. Built-in dental pads.

6. Insertion of esophageal drain tube with a maximum size of 18 Fr.