Item Type: DC Motor Speed Controller Input Voltage: DC6-60V Output Voltage: Linear Under Load Output Current: 0-30A Continuous Current: 20A Speed Control Type: Flowing Adjustment Speed Control Mode: Potentiometer (0-5V) Speed Range: 0-100% Control Frequency: 15KHZ Wiring Type: Fence Terminal Block Knob Cable Length: 20cm Motherboard Mounting Size: Approx. 72 x 39mm / 2.8 x 1.5in(length x width) Potentiometer According to the Opening: 7mm Analog Signal 0-5V Speed Control Connection: The Middle of the Potentiometer is the Signal Cable Make Sure the Positive and Negative Connections are correct before powering Input: 6-60V DC Weight: Approx. 66g / 2.3oz Size: Approx. 8 x 4.5 x 3cm / 3.1 x 1.8 x 1.2in Package List 1 x DC Motor Speed Controller 1 x Knob 1. The input is DC, and it can't be connected to AC (such as 220V AC), otherwise it will burn out the module.2. The positive and negative poles of the power input and output terminals cannot be reversed, otherwise the module will be burned out.3. The motor can be positive or negative. When the direction of rotation is different from the expected, the motor wiring can be changed to change the direction of motor rotation. 1Adopted of high quality electronic components, and accuracy process, ensure for the durability 2The controller has a knob which is easy to operate. 3Great workmanship, perfect replacement for the old or damaged one 4The adjustable speed range is 0-100% 5The controller has large power and high load