Product Name: 4000W AC voltage regulatorMaximum : 4000W (resistive load limit ), long time should be reduced use. Long time 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 0Colour:greenMaterial:plasticPackage Contents:1 * Electronic voltage regulatorNote: 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 , 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.