TS series studio flash light has black anodized aluminum body, compact yet powerful. It is constructed for durability and equipped with ventilation windows. It uses high quality expensive German PerkinElmer flash tube. The lifetime isthree times longerthan others and much more stable in terms of color temperature and flash duration. And the over-heating protection circuit is more security for high volume shooting. It can be triggered by a flash, infrared and PC cord (included). It comes with a test button and variable dial for power setting from 1/16 all the way to full. So is the same way for the halogen modeling bulb. What is more, there are separate switches for the infrared, beeper and modeling lamp. The available accessories include all kinds of softbox with bowen adapter, umbrellas, barndoors and snoot. Specification of studio flash light TS series ModelTS-300ATS-400ATS-500ATS-600ATS-800AOutput power 300WS400WS500WS600WS800WSGuide No.(ISO100)50GN60GN65GN71GN84GNNOutput control range1/16Full variableMoldeling lamp150W250WRecycling time0.8-2.5S0.8-3SColor temperature5600K±200KFlash duration1/8001/1200SMoldeling lamp working modeModeling light ON/OFF,Full,VariableFlash output precision±0.1EVRecycling indicationLED/Beeper/Modeling light indicationWorking voltage170V240V Automatic voltage regulator circuitTriggering methodOptical slave /Sync cable/ Test buttonTriggering voltage12V Lower voltage triggerCooling fanYes