When sourcing a car video interface, you must prioritize system compatibility and signal stability. Ensure the device supports the specific LVDS or RGB protocol of the target vehicle's OEM screen. Key specs include resolution support (typically 800x480 or 1280x720), Plug-and-Play (PnP) wiring harnesses to avoid cutting original cables, and the inclusion of multiple video inputs (such as AV, Rear Camera, and Front Camera inputs). High-quality units should feature a high-speed processor to prevent lag during video switching.