uniquegoods 12V 24V 36V 48V 60V 80V DC 30A PWM Variable Speed Regulator DC Motor Speed Controller Stepless Speed Control Switch HHO Driver Module With Digital LED Display CCM6DS-D Input supply voltage: 12V-80VDC PWM frequency: 21kHz; Duty Cycle adjustable: 0%-100% Suitable current range:current rating: 30A.Recommend Power: 12V:250W,24V:350W,48V:500W The display range of 3-digit LED display is "000"-"100". (For example, displayed "055", it means that the PWM output duty cycle is 55%.) Item size:module:3.94"*2.96"*1.11";display device:3.12"*1.66"*0.95" Net Weight: 5.8 ounces