Specifications Parameter: Input Voltage: 110-120V Current Capacity: 15A Max Rated Current: 10A Frequency: 60Hz Resistive Load: Max 2000W Inductive Load: Max 1000W It is suitable for US standard A plugs and B plugs. High-precision LED voltage display provides real-time output voltage for easy adjustments at any time. Note: 1.This speed controller is only suitable for use with AC brushed motors? Please do not use it with brushless motors. 2.The output voltage of the controller is based on the voltage displayed on the LCD screen. The knob indicates an incorrect voltage, please ignore it. 3. Ensure Proper Voltage Measurement: When the machine operates without a load, the measured output voltage is only virtual. For an accurate voltage reading, connect a load of at least 35W before adjusting the voltage. 4. Suitable Power and Voltage Range: Please operate the machine within the specified rated power and voltage range. It is intended for use with AC grid power only. 5. Normal sound: It is normal for the motor to produce a slight buzzing sound during operation. 6. Power Limits for Different Loads: The mentioned 4000W power rating refers to the maximum limit when using resistive loads. For inductive loads, such as series motors, the power should be limited to 1/3 of the resistive load power. Exercise caution when using the machine with circuit board electronic products. Q:Why do some motors stop when they cannot be adjusted to low speed after use? A:Because some motors have low voltage protection, when the voltage drops below the protection voltage, the motor stops running. (The protection voltage is set by the motor manufacturer, such as 70V, 60V, etc.)