Note: Please allow 1-3mm variation due to manual measurement. Due to differences in display screens and lighting, the actual color of the item may vary from the image. Thank you for your understanding. Specifications: Resistance materials: Metal and plastic Input voltage: AC 220V Voltage regulation: AC 50-220V Maximum power: 2000 W Dimensions: 48 x 56 x 28 mm Connect this device in series with a lamp or home appliance, then rotate the knob to adjust brightness, speed, voltage, or temperature. Designed for high power applications, suitable for common household appliances or small industrial equipment. This voltage regulator features a two-way high-power silicon controlled rectifier and a potentiometer with nuts, allowing direct use without additional components, making it convenient and practical. Applicable Appliances: Electric furnace, water heater, lamps, small motors, electric iron, etc.