This controller uses novel bi-directional high-power SCR. It can be very convenient adjust the current up to 25A, and solve the over current problem of the heating wire resistance is too small in the case of cooling causing good. The output voltage is adjusted anywhere between 50V-220V for use with electrical appliances. It can use to such as electric stove, water heater tune thermal, lighting dimmer, small motor speed, electric iron thermostat, and achieve dimming, thermostats, pressure regulator effect. Specifications: Input supply voltage: 110V ~ 250V AC The output voltage:50V-250V The maximum output power: 2000W The maximum output current :25A The voltage regulating range:50V-250V AC Operation environment temperature: -20 Degree C - 40 Degree C. Module size: 1.85×1.38×1.06 inches (No knobs included). Package Included: 1 ×50 - 220V 25A AC Motor Speed Controller