1,Stepless speed control with silicon controlled trigger2, the introduction of negative voltage feedback technology to make the speed more stable3, with over-current protection cut-off device to make the performance more 4, with displacement to achieve automatic stepless speed regulation5,With photoelectric switch to achieve long-distance controlWith soft device to eliminate the motor starting current is too largInput voltage: AC220V10%, 50/60HzOutput current: 3.5AStatic accuracy: 5%Adapted motor power: 50~500WArmature output voltage: DC0~220VExcitation output voltage: DC200V/1AColour:As ShownMaterial:PCBPackage Contents:1 x speed control boardOnly the above package content, other are not included.Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.