1.Both endoscope and operating instruments adopt high quality stainless steel material.2.Endoscopes adopt the Germany optical glass, optical fiber, and light cone.3.New optical system, wide angle, high resolution. 4.With direction index , sapphire cover, never abrasion. 5.The autoclavable endoscope can be chosen.6.No maintenance valve , It can avoid the valve damage. 7.The direction index of the dial board in the hand wheel of the operators.