Feature: 1. With a peak voltage absorption circuit, it effectively protects the high-power SCR anti-surge, anti-spike, RC absorption multiple protection. 2. Original imported chip SCR, all‑aluminum heat sink, high‑temperature circuit board. 3. Built‑in accurate resistance, high voltage capacitor, stable output, no lag and delay. 4. Use multifunctional industrial sockets, thick copper parts, thicker parts inside the copper parts, high current, good contact and safety. 5. Compulsory certification 3C power cord, thick wire, large current, strong twisting and no deformation, low‑quality plug wire thin and there are safety hazards 6. With stepless variable speed adjustment, free control adjustment, no gear limit Specification: Material: Cold rolled steel, aluminum alloy, thyristor, PCB Item Parameter Output voltage 0-220V adjustable (Voltmeter does not work when the output voltage is lower than 5V) Limit power 4000W (adapt to 2000W-3000W resistive load) Regulating range 0-220V steplessly adjustable (under load condition) step-down to 0V, step-up 10V Rated current 9A Limit current 18A Overload protection switch Yes Output power indicator Yes Thyristor model STMicroelectronics, Thyristor: BTA41-600B/800B Size: Approx.Precautions And Instructions for Use: 3. The 4000W mentioned above refers to the limit power when working in a resistive load. The inductive load is 1/3 of the resistive load. The resistive load refers to the tungsten filament lamp, heating wire, etc., and the inductive load refers to the series motor. And so on, there are circuit board electronic products used with caution. 4. The metal shell of this product must be safely grounded6cm / 2.4in 10cm / 3.9in 9cm / 3.5in 11.5cm / 4.5in Adjustable equipment: motor class: fans, exhaust fans, ceiling fans, snail fans, and other fans without capacitors. Heating category: electric heating wire, electric heating fan, kettle, electric heating pot, heating rod, etc. Dimming category: tungsten lamps. Power tools: angle grinder, electric screwdriver, hand drill, chainsaw, etc. Does not support the regulation of equipment: with circuit board electronic products are not supported, single-phase motors, washing machine motors, dual-value capacitor motors, asynchronous motors, pumps, negative pressure fans, centrifugal fans.. Package List: 1 x AC Voltage Regulator