... width: 0mm~ 10mm continously adjustableSlit height: 1mm, 3mm, 5mm,10mmDiameter of light spots: 1mm, 3mm, 5mm,10mmFilter: Heat absorption, gray, Redfree, Cobalt ... : 18VA Net Weight 750g, portable for carry,with four light spots, equip with all functions of a desktop slit lamp,Volume: 180mmX155mmX370mm