set2: 1 x Electronic voltage regulator + 1 x DC Motor Speed ControllerFeatures: 1203B DC Motor Speed Regulator controls the speed of a DC motor by adjusting Pulse-Width-Modulated (PWM).The input power range is DC 6V-28V .Duty Cycle adjustable range is 0%-100%.Product Name: 4000W AC voltage regulatorMaximum power: 4000W (resistive load limit power), long time should be reduced power use. Long time resistance load recommended within 2000.Efficiency: more than 90%Working voltage: AC 220VVoltage adjustment range: AC 0-220V, Resistive load conditions, starting a dozen volts, callback can be 0Operating instruction:Before you attempting to wire the controller, make sure power is off.WARNING: DO NOT REVERSE POSTIVE AND NEGATIVE POWER LOADS.THIS WILL DAMAGE THE CONTROLLER.TO CHANGE MOTOR DIRECTION, INTERCHANGE THE POSITIVE AND NEGATIVE WIRES OF MOTOR.Color: picture colorMaterial: PC + metal/plasticDC Motor Speed Controller Size: 5 x 3.2 x 1.5cmPackage Contents:1 x Electronic voltage regulator1 x DC Motor Speed ControllerNote: that the load must be connected before it can be regulated is mainly used for resistive load (electric wire incandescent lamp, etc.), single-phase AC motor can also be, but not guaranteed can, other types of load, please confirm by yourselfFuses are not omnipotent, there is reaction time, if the current is too large, in addition to burning the fuse, the module may also burn out.Only the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.