Asus S1 - Manual (Page 19)

LED projector E-Manual 19
Bottom view
Air vents
The air vents allow cool air to enter and warm air to exit the LED
projector.
WARNING! Ensure that paper, books, clothing, cables, or other
objects do not block any of the air vents or else overheating
may occur.
Tripod socket
Attach the LED projector to a tripod using this socket.