Asus UX31LA - Manual (Page 18)

18 Notebook PC E-Manual
Left Side
3 2 1
USB 3.0 port
This Universal Serial Bus 3.0 (USB 3.0) port provides a transfer
rate of up to  Gbit/s and is backward compatible to USB .0.
Headphone output port
This port allows you to connect your Notebook PC to amplified
speakers or headphones.
Memory card reader
This Notebook PC has a single built-in memory card reader slot
that supports MMC, SD, and SDHC card formats.