Viewing Head Monocular Head，30º Inclined，360º Rotatable Monocular Teaching Head，30º Inclined，360º Rotatable Articulated Free Binocular Head，Interpupillary Distance： 55-75mm；30º Inclined，360º Rotatable Articulated Free Trinocular Head，Interpupillary Distance： 55-75mm；30º Inclined，360º Rotatable Articulated Free Binocular Head, Intepupillary Distance:55-75mm, 30ºInclined, 360ºRotatable Built-in Digital Camera System, Resolution:1.30M,3.0M or 5.0M Pixel USB2.0 with Micro-image Process Software