This is a simple and easy-to-use DC motor speed controller that supports soft start and soft stop, reducing the mechanical load on the motor and shaft. It is manufactured with high-quality circuit boards for a longer service life. The speed controller features a digital display panel for easy reading and setting of speeds. Please note that the input terminals of this DC motor speed controller should be connected to a DC power supply. Never connect it to an AC power supply, as this may cause damage. Always ensure that the positive and negative terminals are connected correctly to avoid damaging the speed controller. This speed controller is compatible with 12V motors with a power rating of less than 50W, 24V motors with a power rating of less than 350W, and 48V motors with a power rating of less than 500W. Specifications: - Input Voltage: DC 12V - 80V - Extended Range: 0-- of input voltage Maximum Power: 30A - Power Supply: 12V ≤ 250W, 24V ≤ 350W, 48V ≤ 500W - Speed ​​Range: 0 ~ - Frequency: 21kHz - Controller Dimensions: 110 x 77 x 36 mm / 4.37 x 3.03 x 1.41 inches - Panel Dimensions: 92 x 69 x 13 mm / 3.62 x 2.71 x 0.51 inches Instructions for Use: 1. Setting 1: Soft start to speed time is adjustable between 0-10.0 seconds, with a default value of 1 second. 2. Setting 2: Soft stop time is adjustable between 0-10.0 seconds, with a default value of 1 second. 3. Setting 3: Minimum speed can be adjusted between 0-80%, and must be less than the maximum speed setting. The default value is 0. 4. Setting 4: Maximum speed can be adjusted between 0 and 100%, and must be greater than the minimum speed setting. The default value is 100%. 5. Setting 5: 000, 002, 005, 010, 015, 020, 025 - Each press of the up or down button changes the speed by 1%, 2%, 5%, 10%, 15%, 20%, or 25% respectively. Package includes: - 1 x Speed ​​Controller