The adjustable voltage range smoothly adjusts from 10V to 220V, making it suitable for appliances requiring low voltage to power heating elements. Dual capacitance design incorporates amperometric capacitance and metal film capacitance to absorb surges and voltage spikes, providing improved efficiency and safety. Wide application for adjusting speed, brightness, voltage, and temperature of various electronic devices such as electric furnaces, water heaters, lamps, and small motors. Durable construction features a high-quality enclosure made of 1.5mm thick aluminum and stainless steel for reliable and safe operation. Easy to use with an adjustable rotary knob for precise control of voltage, speed, and temperature. This voltage regulator helps manage over-current issues that may occur with low-resistance heating elements during startup. Utilizes a two-way high-power thyristor with a maximum current capacity of 20A, allowing output voltage adjustment from 0-220V. Suitable for appliances with power up to 4000W. Input Voltage: AC 220V. Voltage Regulation: AC 10-220V. Maximum Power: 4000W. Efficiency: Greater than 90%. Dimensions: Approximately 85 x 55 x 38mm (3.3 x 2.2 x 1.5 inches). Note: Do not exceed the specified maximum power to avoid damage to the module or connected appliance. Color: Silver + Black. Material: Metal + ABS. Package includes: 1 x Voltage Regulator. No other items included. Note: Lighting and display settings may cause slight color variations between the image and the actual item. Measurement may vary by +/- 1-3cm.