Dell Precision M3800 XPS 15 9530 USB SD Card Reader Circuit Board 07DF4 LS-9941P" is a replacement component designed for the Dell Precision M3800 and XPS 15 9530 laptops. This circuit board includes both USB ports and an SD card reader, providing essential connectivity for external devices and storage media. The part numbers 07DF4 and LS-9941P ensure compatibility with these specific laptop models, making it an ideal solution for replacing a faulty or damaged circuit board to restore full functionality.