The operating voltage of the system is 12V.If your car with output voltage of 24V, you cant connect the NVS to power OBDNeed to connect to cigarette lighter with 24V to 12V voltage converter. 2. Vast Pro requires only a slight amount of light to form a crisp image, so image noise will be displayed in a completely dark environment and overexposure when encountered strong light.Before inserting or removing the Micro SD card, turn off the power in case of damage or losing filesWhen you set up the Lanmodo rear camera and connect it to the reverse signal, the Vast Pro will automatically display the rearview during the backup.No need to press the signal switch button.Even if the system is off, the real-time clock will track the current time for 7-15 days.Then you need to reset the time again when you connect the system to a power source.The Vast Pro is a driving aid system and does not completely cover the human vision.Be aware of both the display screen and road conditions.