Asus X540MA E-Manual page 20

Memory card reader
This built-in memory card reader supports SD card formats.
Air vents
The air vents allow cool air to enter and warm air to exit the
Notebook PC.
WARNING! Ensure that paper, books, clothing, cables, or other
objects do not block any of the air vents or else overheating may
occur.
20 Notebook PC E-Manual