Cheap And Discounts Adjustable DC Motor Speed Controller DC 12V-40V 400W 10A Potentiometer PWM Motor Controller Module 13kHz 24V 36V CCMHC CCMHCW Wholesale. Buy Directly From Merchant ZQC Module Store. Enjoy ✓Free Shipping Worldwide! ✓90 Days Buyer Protection. ✓Easy Return. ✓Money Back Guarantee.