Feature: 1. Mini size, portable and lightweight, strong power, easy to use. 2. High power SCR voltage regulator, stepless regulation, help adjust speed, temperature, voltage and light. 3. Adopt high temperature resistant FR-4 circuit board, origin imported chip SCR, full aluminum thermal fin, precisions resistance with high voltage condenser. 4. Separate switch control, freely control the input power and cut off power. 5. No postpone and no delay, with crest voltage absorb circuit. 6. Flame retardant insulation outshell, high temperature resistant, rustproof, anti high pressure and with fine durability. 7. Adopt multi functional industrial sockets, thicken copper part design, with fine contact and safety. 8. Humanized installation hole design, keep flat place or hanging on it is decided by yourself. 9. Silent work, energy saving, stable anti noise, and with wide range of use. 10. Suitable for electrical components, such as: electric stove, water heater, heat transfer lamp dimming, small motor, electric soldering temperature and etc.. Specification: Specifications: Name: SCR Voltage Regulator Material: aluminum Color: black Maximum power: 4000W Rated current: 9A Maximum current: 18A Main machine size: 115 * 100 * 83mm / 4.53 * 3.94 * 3.27in Item weight: 459g / 1.01lb . Package List: 1 * SCR Voltage Regulator Note: When measuring the output voltage when it is empty, it is a virtual voltage. It must be connected to a load of 20W or more to measure the correct output voltage. Input AC power, the output is also AC, not DC. The above mentioned 4000W refers to the ulti mate power when working under resistive load. The inductive load is 1/3 of the resistive load. The resistive load means that the inductive load such as a filament lamp or a heating wire is a series-excited motor, etc., and the circuit board electronic products are used with caution. This product is a metal case and must be grounded safely.