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 free regulation of input power and power cutoff 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 design for excellent contact, safety, and reliability 7. Operates quietly, energy efficient, stable performance with anti-noise capability, 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, and electric welding temperature control 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 voltage; a load of at least 20W must be connected to obtain accurate output voltage readings 2. Input is AC and output is also AC, not DC 3. The stated 4000W refers to maximum power under resistive load conditions. Inductive load capacity is approximately one-third of resistive load. Resistive loads include tungsten filament lamps and heating elements. Inductive loads include series-excited motors. 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 different batches. Slight variations in appearance or color may occur and do not affect functionality Plug Type: US Plug, compatible with countries including Canada, India, Mexico, Thailand, Taiwan, and the Philippines Voltage: AC110V Color: Black Material: Metal Package Contents: 1 x Motor governor Note: Light reflection and display differences may cause slight color variation between the image and the actual item. Measurement error allowance is +/- 1-3 cm