Lenovo 3126, 3120, 3122, 3128 manual If you use speech-recognition software

Connector	Description
Microphone connector	Used to attach a microphone to your computer when you want to record sound or
	if you use speech-recognition software.
PS/2 keyboard connector	Used to attach a keyboard that uses a PS/2 keyboard connector.
PS/2 mouse connector	Used to attach a mouse, a trackball, or other pointing devices that use a PS/2
	mouse connector.
Serial port	Used to attach an external modem, a serial printer, or other devices that use a
	9-pin serial port.
USB connector	Used to attach a device that uses a USB connector, such as a USB keyboard,
	a USB mouse, a USB scanner, or a USB printer. If the USB connectors on your
	computer are not enough for you to connect all your USB devices, you can
	purchase a USB hub, which you can use to connect additional USB devices.
VGA monitor connector	Used to attach a VGA monitor or other devices that use a VGA monitor connector.

Chapter 1. Product overview 9