1. AC power cannot be input, let alone 220V mains power. 2. The maximum allowed input voltage is 75V, and no overvoltage input or reverse polarity connection is allowed. 4. When connecting the output terminal to the battery, be careful not to reverse the positive and negative poles. 5. The product is a step-down module, the maximum output voltage = input voltage * 0.95-1V. 3． The output cannot be completely guaranteed to prevent backflow. When connecting the battery, that the output voltage of the power module is always higher than the battery voltage, or connect a diode in series with the positive terminal of the output to conduct one-way conduction to prevent the battery voltage from backflow and burning the power supply. Product parameters: Product name: CNC DC step-down power supply; Product model: -6522C (color screen model); Input voltage: 6.0-75.00V; Output voltage: 0.0-65.00V; Output current:0-22A; Output voltage accuracy: ±0.3% + 3 words (can be calibrated); Output power: 0-1430W; Output current accuracy: ±0.5% + 3 words (can be calibrated) Voltage resolution: 0.01V; Current resolution: 0.01A; Data group storage: 11 groups; Silicone buttons: 5; Screen size: 1.8-inch upgraded large screen, 36 x 29mm viewing range, Weight: 0.661386786 pounds, Manufacturer: Tuidzljd