1. 100% 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, rustproof, 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 anti-noise performance, suitable for a wide range of applications 8. Suitable for 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 phantom 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 one-third of resistive load. Resistive loads include tungsten filament lamps, heating wires, etc. Inductive loads include series-excited motors, etc. Use with caution when connecting electronic devices containing circuit boards 4. This product has a metal housing and must be properly grounded Note: Product design may be updated periodically. Due to different production batches, the actual product may have minor variations or color differences, which do not affect functionality Plug Type: US Plug, compatible with Canada, India, Mexico, Thailand, Taiwan, the Philippines, and other regions using US plug standards Voltage: AC110V Color: Black Material: Metal Package Contents: 1 x Motor governor (Only the above items included; other accessories not included) Note: Lighting and display differences may cause slight color variation between the product image and actual item. Measurement error allowance: +/- 1-3 cm