Product description: 100% brand new and high quality Made of high-quality materials, durable The input is connected to AC 220V, the output is connected to the electric furnace line or electrical appliances, and then rotate the knob to control the speed, voltage, and temperature Thyristors are mainly used for resistive loads (wire incandescent lamps, etc.). Most single-phase AC motors are acceptable, but cannot be guaranteed. Other types of loads should be confirmed by the buyer. The fuse is not omnipotent, it has a response time. If the current is too large, in addition to burning the fuse, it may also burn the module. Product parameters: Product name: 4000W AC voltage stabilizer Working voltage: AC 220V Voltage regulation: AC 10-220V Maximum power: 4000W (resistive load connected) Efficiency: more than 90% Size: 85(L) x 55(W) x38(H)MM Protection: Anti-spike, surge, RC absorption (EOC) Style: convenient and practical Color: as shown Note: The load must be connected before voltage stabilization. Some applications: Precautions for electric stoves, water heaters, lamps, small motors, electric irons, etc.: The load should not exceed the maximum power, otherwise it will burn the module and electrical appliances; Try to use resistive loads; greatly reduce the power of inductive and capacitive loads. (It is better to keep more than half) Package list: 1 * Motor speed controller module Note: 1.The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness. 2.Please allow slight manual measurement deviation for the data.