AmScope 40x-2500x Cordless LED Compound Biological Microscope Cordless LED Microscope with 360 Degree Rotatable Monocular Head Offering Six Widefield Magnification Powers up to 400X Sturdy Metal Framework with Disc Diaphragm Separate Coarse &amp; Fine Focus with Tension Control Wall-Power Adapter/Recharger and Three Rechargeable Batteries Included