High Performance Led: Bright And Absolutely Homogeneous Illumination With An Excellent Colour Rendering Colour Temperature 4000 K, Colour Rendering Index > 95, And > 90 Rendering Index Of The Colour Red.Exclusive Battery Performance Indicator: When The Instrument Is Switched On, The Maximum Light Intensity Is Shown, Then The Light Intensity Is Regulated Down To The Level That Corresponds To The Current Charge Status Of The Battery So You Know When Your Batteries Need Changing.Exclusive Fade Out Function Reduces Illumination Intensity With Battery Level To Let You Know When To Replace.Operation Time Up To 10 Hours. The Batteries Need To Be Changed Less Often And The Rechargeable Batteries Last Longer.The Heine Optics Produce Crisp, Clear Images Of The Whole Area Under Examination And Minimize The Reflections.5 Different Apertures. A Full-Function Instrument Incl. Fixation Star.Grey Filter For Light-Sensitive Patients.Range Of Lenses: 18 Lenses From -20 D To +20 D.+ 1 2 3 4 6 8 10 15 20 D- 1 2 3 4 6 8 10 15 20 D.