Asus X450JF - Manual (Page 22)

 Notebook PC E-Manual
Optical disc drive manual eject hole
The manual eject hole is used to eject the drive tray in case the
electronic eject button does not work.
WARNING! Use the manual eject hole only when the electronic
eject button does not work.
NOTE: For more details, refer to the Using the optical drive
section in this manual.
Kensington® security slot
The Kensington® security slot allows you to secure your
Notebook PC using Kensington® compatible Notebook PC
security products.