1.A bevelled tip will pass much easier through the vocal chords than a tube with a cross-cut distal opening. 
2. The bevel is left-facing rather than right-facing to allow a better view of the ETT tip entering the field of view from right to left/         midline and then passing throught the vocal chords.
3. The Murphy eye provides an  alternate gas passage way
4. A pilot balloon which allows for (rough) tactile and visual confirmation of cuff inflation after intubation or deflation just before extubation.
5. A standard  15mm connector  allows attachment of a variety of breathing systems and anesthetic circuits. 
6. A radio-opaque line is helpful to confirm an adequate tube position on a chest X-ray 
7. The Magill curve makes tube insertion easier as the curve follows the anatomy of the upper airway. 
8. Designed for Short or Long-Term Intubations
9. The high voloume low pressure cuff  applys a lower pressure against the tracheal wall and have a lower incidence of tracheal      wall ischemia and necrosis.

Medical Endotracheal Tube is used for surgery with a general anesthetic, trauma, or serious illness. An endotracheal tube is placed when a patient is unable to breathe on their own, when it is necessary to sedate and “rest” someone who is very ill, or to protect the airway. The tube maintains the airway so that air can pass into and out of the lungs.