1,AC VOLTAGE REGULATOR: This module is used for regulating AC voltage, with high power of 1000W, practical and effective. 2,MULTI FUNCTION: This AC voltage regulation board is multifunctional, which can be used to control serial port dimming, speed and temperature. 3,MANUAL CONTROL: The module is designed with button, you can control the output voltage plus or minus manually through the button. 4,ADJUST METHOD: This module controls the load stepless voltage regulation by adjusting 0 to 5V signal voltage. 5,SUPPORT PROTOCOL COMMUNICATION: The module supports standard serial port protocol communication, add more convenience. 1 x Voltage Regulation Module Item Type: Voltage Regulation ModuleMaterial: ABSColor: WhiteVoltage: 220VPurpose: Serial port dimming, speed, temperature control Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.