Handle Slit Lamp Microscope Portable Special Eye Microscope Pocket Optical Biomicroscope for Anterior Eye Exam ML5S1 High illumination whitel led light souce Rechargeable green lithium battery fully charged can be used for 5 or 6 hours Light-weight& compact design , sigle hand operate Link-able eyepiece equip with four spots Can be digitized by coopix camera or phone eyepiece adapters Microscope  Eyepiece lens 10X and 16X Objective lens 1X Diopter adjustment ±5D Pupil Distance 52-72mm Working Distance 80mm Slit Illumination Part Slit Width 0-10mm continuously adjustable Slit Height 0.5mm, 3mm, 5mm, 10mm Spot Rotator Angle 0.5mm, 3mm, 5mm, 10mm Slit Rotator Angle Horizontal ±30° Fliters Hear absorption, Grey, Red free, Coball blue Illumination White LED Working hours 5-6 hours Voltage / Frequency AC 220V10% / 50Hz 1Hz AC 220V10% / 60Hz 1Hz General  Net weight 750G Gross Weight 2.5KGS Package White and Black Caarring Cases for Choice Package Size 410mm* 195mm*230mm