This is a kind of fine quality high SCR voltage regulator, stepless regulation, help adjust speed, temperature, voltage and light. Adopt high-temperature resistant FR-4 circuit board, origin imported chip SCR, full aluminum thermal fin, precisions resistance with high voltage condenser. No postpone and no delay, with crest voltage absorb circuit. You can have a try. Features: size, portable and lightweight, strong , easy to use. High SCR voltage regulator, stepless regulation, help adjust speed, temperature, voltage and light. Adopt high-temperature resistant FR-4 circuit board, origin imported chip SCR, full aluminum thermal fin, precisions resistance with high voltage condenser. No postpone and no delay, with crest voltage absorb circuit. retardant insulation outshell, high temperature resistant, rustproof, anti high pressure and with fine durability. Adopt multi functional industrial sockets, thicken copper part design, with fine and safety. Humanized installation hole design, keep flat place or hanging on it is decided by yourself. Silent work, energy saving, stable anti-noise, and with wide of use. Suitable for water heater, lamp, small motor, electric iron and etc.. Notes: When measuring output voltage when it is empty, it is a virtual voltage. It be connected to a load of 20W or more to measure correct output voltage. Input AC , output is also AC, not . above mentioned 4000W refers to ulti mate when working under resistive load. inductive load is 1/3 of resistive load. resistive load means that inductive load such as a filament lamp or a heating wire is a series-excited motor, etc., and circuit board electronic products are used with caution. This product is a metal case and be grounded safely. Specifications: Name: SCR Voltage Regulator Material: aluminum Color: grey Input voltage: AC 110 V Output voltage: 0-220 V Max : 4000W Voltage adjusting : 0-220 V Rated current: 9A Max current: 18A Main machine size: 100 * 83 * 75mm / 3.94 * 3.27 * 2.95in Item weight: 418g / 0.92lb Package size: 145 * 85 * 105mm / 5.71 * 3.35 * 4.13in Package weight: 450g / 0.99lb Package list: 1 * SCR Voltage Regulator