Asus R552LF - Manual (Page 21)

Notebook PC E-Manual 1
Right Side
Memory card reader
This Notebook PC has a single built-in memory card reader slot
that supports MMC, SD, and SDHC card formats.
USB 3.0 port
This USB (Universal Serial Bus) 3.0 port provides a transfer rate
of up to  Gbit/s and is backward compatible to USB .0.
Optical disc drive
Your Notebook PC’s optical disc drive may support several disc
formats such as CDs, DVDs, recordable discs, or rewritable discs.
Optical disc drive indicator
This indicator lights up when the optical disc drive electronic
eject button is pressed while the Notebook PC is powered
on. This indicator also lights up when the optical disc drive is
currently reading data from or writing data to a disc.