Product Name: 4000W AC voltage regulator Maximum 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 220V Voltage adjustment range: AC 0-220V, Resistive load conditions, starting a dozen volts, callback can be 0 Colour:green Material:plastic Package Contents: 2 x Electronic voltage regulator Note: 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 yourself Fuses 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.