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Headphones (or head-phones in the early days of telephony and radio) are a pair of small loudspeaker drivers worn on or around the head over a user's ears.

They are electroacoustic transducers, which convert an electrical signal to a corresponding sound.

Headphones let a single user listen to an audio source privately, in contrast to a loudspeaker, which emits sound into the open air for anyone nearby to hear.

Headphones are also known as earspeakers, earphones or, colloquially, cans.

Circumaural and supra-aural headphones use a band over the top of the head to hold the speakers in place.

The other type, known as earbuds or earpieces consist of individual units that plug into the user's ear canal.

In the context of telecommunication, a headset is a combination of headphone and microphone.

Headphones connect to a signal source such as an audio amplifier, radio, CD player, portable media player, mobile phone, video game console, or electronic musical instrument, either directly using a cord, or using wireless technology such as Bluetooth, DECT or FM radio.

The first headphones were developed in the late 19th century for use by telephone operators, to keep their hands free.

Initially the audio quality was mediocre and a step forward was the invention of high fidelity headphones.

A smartwatch is a touchscreen wearable computer in the form of a wristwatch.

While early models could perform basic tasks, such as calculations, digital time telling, translations, and game-playing, 2010s smartwatches have more general functionality closer to smartphones, including mobile apps, a mobile operating system and Bluetooth connectivity.

Some smartwatches function as portable media players, with FM radio and playback of digital audio and video files via a Bluetooth or USB headset.

Some models, called 'watch phones' (or vice versa), have complete functionality of a typical smartphone.

A webcam is a video camera that feeds or streams its image in real time to or through a computer to a computer network.

When "captured" by the computer, the video stream may be saved, viewed or sent on to other networks travelling through systems such as the internet, and e-mailed as an attachment.

When sent to a remote location, the video stream may be saved, viewed or on sent there.

Unlike an IP camera (which connects using Ethernet or Wi-Fi), a webcam is generally connected by a USB cable, or similar cable, or built into computer hardware, such as laptops.