1. 2. Compact size, lightweight, powerful, and easy to use 3. High-power thyristor voltage regulator with stepless adjustment for controlling speed, temperature, voltage, and light 4. Switch control allows users to freely manage input power and disconnect power supply 5. Fireproof and heat-insulating shell, high temperature resistant, rust proof, high pressure resistant, and durable 6. Features a multi-functional industrial plug with thickened copper contacts for excellent conductivity, safe and reliable performance 7. Operates quietly, energy efficient, stable anti-noise performance, suitable for a wide range of applications 8. Compatible with various electrical components such as electric furnaces, water heaters, heat transfer lamps (dimming), small motors, electric welding temperature control, etc. Input Voltage: AC110-220V Output Voltage: 0-220V Maximum Power: 4000W Voltage Adjustment Range: 0-220V Rated Current: 9A Maximum Current: 18A Precautions and Instructions for Use: 1. When the unit is unloaded, the measured output voltage is a virtual reading; a load of at least 20W must be connected to obtain an accurate output voltage measurement 2. Input is AC and output is also AC, not DC 3. The stated 4000W capacity refers to maximum power under resistive load conditions. Inductive loads should not exceed one-third of the rated resistive load capacity. Resistive loads include tungsten filament lamps, heating elements, etc. Inductive loads include series-excited motors, etc. Use caution when operating electronic devices containing circuit boards 4. This product has a metal housing and must be properly grounded Note: Product design may be updated across batches. Actual product may vary slightly in appearance or color compared to images, which does not affect functionality Plug Type: US Plug (compatible with Canada, India, Mexico, Thailand, Taiwan, the Philippines, etc.) Voltage: AC110V Color: Black Material: Metal Package Contents: 1 x Motor governor Note: Light reflection and display settings may cause slight color differences between the image and the actual item. Measurement tolerance: +/- 1-3 cm