AmScope 40X-1000X Cordless Glass Optics All-Metal Student Biological Compound Microscope 360&deg; rotatable monocular head w/ optical glass lenses Five magnification settings, 40X, 100X, 250X, 400X and 1000X Single lens condenser with 6-hole disc diaphragm LED illumination via either an outlet or 3AA batteries Sturdy all-metal framework