---Dimension: 112 mm ( L ) X 33 mm ( R ); * ---Magnification Ratio: 25X ~ 200X (Manual) ; * ---Focus Range: Manual Focus from 3 mm to 40 mm;Operation System: Windows 7 32 bit and 64 bit/Vista/XP; * ---Packing Contents: 1 x USB Digital Microscope 25X~200X(Black Color);1 x Black Plastic Desktop Stand; 1 x CD Driver (Comes With User Manual);1 x Plastic Ruler; * ---Our products are all from factory direct supply, we can guarantee 100% inspection before shipping. If any problems of our products really exist, an exchange or a refund is available.