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12-40V 30A 360W Hydrogen Booster HHO PWM Controller   This item include: one controller board + one potentiometer (47K) with wires + 4 wires with socket Profile: This is a brand new PWM controller, easy to use and high effective. It can be used in below fields: 1. HHO devices. 2. DC motor speed control. 3. LED or DC bulb lightness control. 4. Other fields need PWM control.  Features: 1. Input 12-40VDC, the controller detect the voltage auomatically, and output 12-40VDC corresponding. 2. Output 360W, maximum current 30A. 3. PWM adjustment range: 0%-100%. 4. One spare 2-pin connector is available for fan adding (12-40VDC corresponding to input voltage). 5. Size: 75x55x35mm (3.0x2.2x1.4 inch) Note: Wire according to drawing.  Do not reverse power polarity. Any other question, please feel free to contact me. I will reply your message in 24 hours. Shipping We provide combined shipping. Nomally,  The delivery time of airmail is 7-15 business days. EMS (5-7 business days) and DHL / UPS (2-4 business days) are available, but the shipping fees are higher. Please contact us first. Payment We accept Paypal only. Warranty 7 days warranty.  Feedback If you aren't satisfy the item you received, please contact me first. Please don't leave negative (neutral) feedback without communication.