Lenovo IdeaCentre B305 User Manual page 11

1.5.2 Connect the keyboard cable to the appropriate keyboard
connector (PS2 connector or USB connector).
1.5.3 Connect the mouse cable to the appropriate mouse
connector (USB connector).
1.5.4 If you have audio devices, attach them using the
following instructions:
Microphone
Headphone
6
User Guide
1
Use this connector to attach a microphone (purchased separately)
to your computer when you want to record sound or if you use
speech-recognition software.
Use this connector to attach headphones (purchased separately)
to your computer when you want to listen to music or other
sounds without disturbing anyone.
2