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Product Specifications Product Name: Digital Display PWM Speed Controller. Material: Circuit Board. Model: QW21. Input Supply Voltage: DC 6V-60V. Output Current: 0-30A. Persistent Current: 20A. Output Voltage: Linearity Under Load. Speed Range: 0-100%. Speed Control Type: Regulating Flow. Speed Regulation Method: Potentiometer. Connection Type: Barrier Terminal. PWM frequency: 15KHZ. Panel Dimensions: 96mm*61mm*34mm/ 3.8"*2.4"*1.3" (L*W*H). Knob Wire Length: 18cm. Package Content: 1 Pcs. NOTICE 1. Digital display is a percentage of actual speed to maximum speed, not the actual speed. 2. The input voltage must be distinguished between positive and negative poles. 3. 110V household electricity cannot be input. 4. The input voltage must be equal to the rated voltage of the motor within the range of 6-60V. If you have any problems, we are very willing to solve the problems for you.♥