Asus A550DP E-Manual page 21

LAN port
Insert the network cable into this port to connect to a local area
network (LAN).
USB 3.0 ports
The Universal Serial Bus 3.0 (USB 3.0) ports provide a transfer
rate of up to  Gbit/s and are backward compatible to USB .0.
Headphone output/microphone input combo jack port
This port allows you to connect your Notebook PC to amplified
speakers or headphones. You can also use this port to connect
your Notebook PC to an external microphone.
Notebook PC E-Manual
1