Working Voltage:AC 220V Maximum Power:3800W Voltage Regulation:AC 0~220V It is a heat-resistant FR-4 circuit board. Connect it in an electrical circuit of a desk lamp or other electrical products(i.e.Cut off neither L wire or N wire of their circuit and connect the board with the cut wire). Then you can control the brightness speed voltage and temperature by switch the knob bar. It is very convenient to use. The regulator is made of powerful SCR(silicon controlled rectifier) perfectly avoid the problem of over-current. It can flexibly adjust the voltage between 0 to 200V for electrical products such as electric stove water heater lights minor generator and soldering iron etc. As it supports strong power to 3800W it is suitable for family electrical use and small factory use.