Notebook PC E-Manual23USB 3.0 portThe USB 3.0 (Universal Serial Bus 3.0) port provides a transferrate up to 5 Gbit/s and is backward compatible to USB 2.0.Memory card readerThis built-in memory card reader supports SD card formats.USB 2.0 portThe USB (Universal Serial Bus) port is compatible with USB 2.0or USB 1.1 devices such as keyboards, pointing devices, flashdisk drives, external HDDs, speakers, cameras and printers.Headphone/Headset/Microphone jackThis port allows you to connect amplified speakers orheadphones. You can also use this port to connect your headsetor an external microphone.