tower case: back view![click to hear](/images/speaker.jpg)
audio jack ![click to hear](/images/speaker.jpg)
Connection device that attaches the computer to a variety of sound recording and reproduction equipment such as a microphone and loudspeakers.
game/MIDI port ![click to hear](/images/speaker.jpg)
Connector that attaches the computer to a game device (e.g., a joystick) or a digital musical instrument.
case fan ![click to hear](/images/speaker.jpg)
Device blowing air to cool the internal components of the tower case.
network port ![click to hear](/images/speaker.jpg)
Connector that attaches the computer to a network.
power supply fan ![click to hear](/images/speaker.jpg)
Device blowing air to cool the internal components of the power supply unit.
power cable plug ![click to hear](/images/speaker.jpg)
Device with metal prongs that connects the computer by power cable to an electric circuit.
mouse port ![click to hear](/images/speaker.jpg)
Round connector that links the computer to the mouse.
keyboard port ![click to hear](/images/speaker.jpg)
Round connector that links the computer to the keyboard.
USB port ![click to hear](/images/speaker.jpg)
Connector used to link several USB standard peripherals simultaneously; it is faster than serial and parallel ports.
serial port ![click to hear](/images/speaker.jpg)
Connector used to attach a computer to various peripherals such as an external modem; it is slower than a parallel port as it exchanges only one bit at a time.
internal modem port ![click to hear](/images/speaker.jpg)
Connector used to attach the internal modem (a two-way digital signal changing device) to a telephone line.
video port ![click to hear](/images/speaker.jpg)
Connector used to attach the computer monitor to the video board; the latter is inserted in the tower case and controls the display of texts and graphics.
parallel port ![click to hear](/images/speaker.jpg)
Connector used mainly to attach the computer to a printer; it is faster than a serial port as it exchanges data in eight-bit groups.