BenQ Joybook R48 Series User Manual page 12

Connect an earphone to the audio output jack to output
sounds.
Connect a microphone to the microphone input jack to record
sounds.
8 Getting started
Connect USB peripherals to the USB port(s) of your Joybook.
Connect an external hard disk or a device that has an eSATA/
USB interface to the eSATA/USB port of your Joybook.