Warranty: 90 Stunning white light HDTV picture performance and enhanced NBI Insertion tube rotation function Fully waterproof endoscope and one-motion connector Optical system Field of vision 120º visual direction 0º Depth of field 3–100mm HDTV picture quality Insertion section Outer diameter of distal end 5.5mm Tube outer diameter insertion 5.1mm working length 600mm tube rotation function insertion Yeah Biopsy channel Internal diameter of the channel 2.0 mm Minimum visible length 3 mm from the distal end Direction in which accessories enter or exit Endotherapy in the endoscopic image Return Policy90 days warranty Return in case of manufacturing defects Return for incopatibility assumed by the buyer