Material: Silicon controlled semiconductor; Size: approx. 85*55*38mm; Operating voltage: AC 220V; The highest power: 4000 watt (connected resistive load, long -term use shows the lower power) Under a current of 10 amps, no need for additional cooling. Over 10 current amps, you have to add a coolant. Voltage regulation: AC 10 -entry Characteristic: Control the speed of an alternating current engine with this controller, FR printed circuit - 4 high temperatures, fine manufacturing and stable performance. Sustainable use. Used in an electric oven, a water heater, lamps, a small engine, an electric iron, etc. Suitable for the alternating current brush engine. user manual: Adjustable power supply card, connect this device to the lamp or to the household appliance or to the electrical circuit. Then turn the button for gradation, speed, voltage, temperature control. included: 1 part x voltage regulator (without the shell) Description: This controller uses a new High power bidirectional SCR. It is very practical to adjust the current up to 25a, and to solve the problem of overcurrent the resistance of the heating wire is too low in the event of cooling which causes well. The output voltage is set between 50V-220V For use with electrical devices. It can be used for such an electric stove, adjustment of the thermal water heater, lighting variator, small motor speed, electric iron thermostat, and obtain a gradation, thermostatics, a pressure regulator effect. Specification: -put power supply: 110V ~ 250V CA -The output voltage: 50v-2550v (output voltage