IMPORTANT NOTES: DC motor controller input is DC, cannot be directly connected to AC Positive and negative power supply cannot be reversed, otherwise the controller will be damaged Functions Setting: Function 1: Soft-start Setting. [000-100], Soft start to 100% speed time can be adjustable between 0-10.0s. Default is 1s. Function 2: Soft-stop Setting [000-100], Soft stop time can be adjustable between 0-10.0s. Default is 1s. Function 3: MIN Speed Setting [000-080], The min speed can be adjustable from 0 to 80%, and must be less than the max speed setting value. Default is 0. Function 4: MAX Speed Setting [000-100], The max speed can be adjustable between 0-100%, and must be more than the min speed setting value. Default is 100% Function 5: Speed Regulation Accuracy Setting [000, 002 , 005 , 010 , 015, 020 , 025], Accuracy: 1%, 2%, 5%, 10%, 15%, 20%, 25% can be chosen. Set the min changed value, when press the UP or DOWN keys. Specifications: Input Voltage: DC 12V-80V Power: max 250W cont. for 12V; max 350W cont. for 24V; max 500W cont. for 48V Max Current: 30A Speed Adjustable Range: 0~100% PWM Frequency: 21 kHz Controller Dimensions: 11x7.7cm/4.33x3.03 Panel Dimensions: 9.7x6.9cm/3.82x2.72 Quantity: 1 Set Note: Please allow 1-3mm error due to manual measurement. pls make sure you do not mind before you bid Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you No Retail Package Package Includes: 1 x DC Motor Speed Controller 1 x Digital Display Panel