Specifications include, but are not limited to: Leica EZ4 Stereo Microscope: Non-removable 10x/20 eyepieces 4.4:1 Zoom Stereo Microscope with 8x35x zoom range 10x/20mm high eye point 50-75mm interpupillary distance 100mm working distance No removable parts Plug and play design All-in-one Tool-free tension adjustment Built-in 25,000 hour 6500 K Reflected, 4500 K Transmitted, true daylight Constant-color temperature power LED illumination for BOTH reflected and transmitted light Variable light intensity control for reflected and transmitted light Reflected light and transmitted light can be used separately or simultaneously 3 directional reflected illumination (fill, top and oblique) Auto shutoff after 120 minutes