ELEGIANT DC 10-50V 60A High Power Motor Speed Controller PWM HHO RC Driver Controller Module 12V 24V 48V 3000W Extension Cord with Switch Compact in size, wide voltage & current range. Use PWM modulation system to adjust light & speed. With radiators to doing heat dissipation created by MOS tube. With wire to connect potentiometer for more convenient speed control. Protective case creates better durability; max power of 3000W and small noise.