This SCHOTT cold light source system includes a LED ring light and a KL 2500 LED cold light source.Inside Diameter- 66mm (2.60inch)Outside Diameter- 96mm (3.78inch)Ring Height- 26mm (1.02inch)Connecting Pipe- 1000mm (39.37inch) longWorking Distance- 30mm-300mm (1.18inch - 11.81inch)Color Temperature- 5600KLuminous Flux- Up to11002 lm light flux.Voltage- 100~240V, 50-60Hz.Light Box- Intensity control 0-100%, and filter slot with 2-position filter slider. LCD display indicates brightness / operation mode. USB connectivity for PC control.Light Box Dimensions / Weight- 114mm x 231mm x 137mm (4.5inch x 9.1inch x 5.4inch), 3.6kg (7.9 lb)Certifications- CEWarranty- 2 years