Ports for plug-in peripheral devices such as a video display, cassette tape recorders, joysticks, and (later) disk drives either were built-in or available on expansion cards.

Other forms of controllers (about $12-$80 each), ranging from plug-in table-top devices to personal computer interfaces, are also available.

With plug-in device and cord for recharging, the travel WaterPik comes in a black ditty bag that stows conveniently (although not weightlessly) in your suitcase.

Many peripherals that require an internal card on a Windows machine are simply plug-in devices for the Mac.

To mute the noise and clear the air, some plug-in devices are available from retailers or through catalogues.

The new operating system has expanded support for all sorts of plug-in and peripheral devices, making Pocket PC-based devices the most versatile on the market.

The Screaming Bird was a plug-in device, whereas the Screaming Tree was a foot-pedal.

Appropriately named Square, his new business is enabling people to receive payments via their smartphones, using an app and a plug-in device.

It is a plug-in device that sits on the accessory shoe and increases the metering sensitivity by a factor of 16 for measuring exposure in poor light.

Being known to be subject to a number of common failure modes, most tubes were designed and installed as plug-in devices, not soldered into a circuit.