Trinocular Microscope :Head: 360 degree rotatable 45 degree included binocularEyepieces: 30mm super widefield high-eyepoint WF10X/20MMObjective Zoom Range: 0.35X-9.0X, using the Barlow lensesWorking Distance: 8 (200mm)Diopter Adjustment: +/- 5dpInterpupillary Distance: 2-3/16 - 2-15/16(55-75mm)Illumination: 144-LED Ring LightPower Input: 110-240V, 50-60HZ, Automatic SwitchingAccessories: Paired eye-caps