Headphones

Headphones may be used both with fixed equipment such as CD or DVD players, home theater, personal computers and with portable devices (e.g. digital audio player/mp3 player, mobile phone, etc.). Cordless headphones are not connected via a wire, receiving a radio or infrared signal encoded using a radio or infrared transmission link, like FM, Bluetooth or Wi-Fi. These are powered receiver systems of which the headphone is only a component. Cordless headphones are used with events such as a Silent disco or Silent Gig. ... Wired headphones are attached to an audio source. The most common connectors are 6.35 mm (¼″) and 3.5 mm phone connectors. ... The 3.5 mm connector remains the common connector for portable application today. [Headphones. Wikipedia]