Greenough zoom optical system. Binocular or trinocular head (according to model) 45° inclined and 360° rotating. Widefield WF10X/23 mm eyepieces. Zoom ratio 6.7:1 and magnification range 0.75X-5X. 110 mm working distance. Base with LED illumination with intensity control. Coarse focusing system with tension adjustment. Dust cover included. Supply 100-240 V (CE). Warranty 5 years on optical and mechanical components. Delivery time 3 - 4 weeks