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The second-, third-, and fourth-generation iPod Shuffle uses a single 3.5 mm minijack phone connector which acts as both a headphone jack or a USB data and charging port for the dock/cable. The dock connector also allowed the iPod to connect to accessories, which often supplement the iPod's music, video, and photo playback.
An alternative to this is a compound device, in which the host assigns each logical device a distinct address and all logical devices connect to a built-in hub that connects to the physical USB cable. USB endpoints reside on the connected device: the channels to the host are referred to as pipes.
The iPod's signature click wheel. iPods with color displays use anti-aliased graphics and text, with sliding animations. All iPods have five buttons and the later generations (4th and above) have the buttons integrated into the click wheel — a design which gives an uncluttered, minimalist interface, though the circuitry contains multiple momentary button switches.
Video was added to the connector. FireWire was phased out of the iPods, which led to a discontinuity in usage of the dock connector. As a result of the popularity of Apple's iPod and iPhone devices using the connector, a cottage industry was created of third-party devices that could connect to the interface. [5]
Apple Lightning to USB-A cable. Lightning is an 8-pin digital connector. Unlike the 30-pin dock connector it replaced (and USB Type-A and -B connectors), it is reversible. [24] Most Lightning devices only support USB 2.0, which has a maximum transfer speed of 480 Mbit/s or 60 MB/s. With USB 2.0, only one lane is in use at a time.
Unlike the second generation, the iPod does not come with a dock, but like the third generation, comes with a 45 mm USB Cable. The included in-box headphones do not feature the remote control, but the device supports them. On September 10, 2013, to coincide with the release of the iPhone 5S, the "Slate" color option was replaced with "Space Grey".
USB was designed as a single connector to support all needs, including any generic data, audio/video, power, and more; DisplayLink is its most successful Audio+Video protocol. Until the 3.0 revision, very low data rates meant most A/V needed alternative connectors.
The fourth-generation iPod Touch was the first iPod to offer front and rear facing cameras. It is a slimmer, lighter model than its predecessors and the iPhone 4 , and introduces a Retina Display . Other improvements include support for recording 720p video via the rear camera, and Apple's A4 chip (the same chip used in the iPad (1st generation ...