Precautions: 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. 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 prevent one-way conduction. Prevent battery voltage from flowing back and burning the power supply. 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.<br><br>protection mechanism: Input undervoltage protection (LUP): 5.5-64V adjustable, factory default value 5.5V Output overvoltage protection (OUP): 1-66V adjustable, factory default value 66V Output overcurrent protection (OCP): 0.001-23A adjustable, factory default value 23A Output over-power protection (OPP): 1-1450W adjustable, factory default value 1450W Over-temperature protection (OTP): 30-99 adjustable, factory default value 60 Overtime protection (OHP): 1 minute-99 hours and 59 minutes, factory default is off Over capacity protection (): 0.001-9999Ah, factory default is off Over energy protection (OPH): 0.001-4000KWh, factory default is off Material: ABS colour: Black<br><br>Package Contents: 1 set of CNC step-down DC module<br><br>Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.