["Features:\r\nAdopts double insulation; there will be no electric leakage if short-circuit or SCR burn out.\r\nCan prevent for peak voltage and electrical surge; RC absorption and fuse enhance usage safety.\r\nAluminum for case prevents it from easy damage; filled tin prevents it from heating when in huge current.\r\nWith protective cap and connection post; thicker and larger heat sink.\r\nWide application: electric furnace, water heater, lamps, small motor, electric iron etc.\r\n\r\nHow to use:\r\nAdjustable Power Supply Board; connect this device with lamp or home appliance or electric circuit, then rotate the knob for dimming, speed, voltage, temperature control. \r\n\r\nSome Applications:\r\nElectric furnace, water heater, lamps, small motor, electric iron etc. \r\n\r\nSpecifications:\r\nWorking Voltage: AC 220V \r\nMaximum Power: 4000W (connected resistive load) \r\nVoltage Regulation: Begin from 10V, 10V-220V\r\nProtection: Anti-spike, Surge, RC absorption (EOC) \r\nSize: 85x65x38mm/3.35x2.56x1.5\"\r\nQuantity: 1 Pc\r\nNote:\r\nPlease allow 1-3mm error due to manual measurement. pls make sure you do not mind before you bid\r\nDue to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!\r\n\r\nNo Retail Package\r\nPackage Contents:\r\n1 x Voltage Regulator"]