The products are mainly used for resistive loads (such as wire, soldering iron, heater, 220V drill with brush, electric fan, blower, blower, incandescent lamp, halogen lamp, tungsten iodine lamp, etc. .), energy saving lamp, LED light. Features: Can play dimming , thermostats, pressure effect. The output is connected to the electrical wire or appliances electrical, rotary potentiometer, can play speed, pressure, thermostat. Using the new bi-directional high-power thyristor, because the maximum design current can reach 20A. A good solution to the problem of over-current electrical wire in cooling case caused by resistance is too small, can easily adjust the output voltage between AC0V and AC220V. Features: Input voltage: 220V Adjustable voltage range: 0-220V Maximum power: 4000W Main color: silver Size Item Weight: 85*58*38mm/3.3*2.3*1.5in Item Weight e: 130g / 4.6oz Package size: 90 * 60 * 40mm / 3.5 * 2.4 * 1.6in Package weight: 135g / 4 .8 oz Package List: 1 * Voltage Regulator