PJAUTO 7 Inch AI BSD Camera System support 2-4CH , four-split screen display, digital video recording, and active detection alarms. It automatically issues alarms via screen and voice (or beep) simultaneously. You can set and adjust the danger zone according to the actual application to avoid false or unnecessary alarms. The system is waterproof and can work properly in adverse weather conditions. Whether it is rainy/dark environment or haze weather, the system can provide reliable image display to ensure the safety of the driver.