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The first iPod was capable of holding 5 GB and 1,000 songs. It also had a black and white LCD(liquid crystal display).
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The second generation had 10 GB and 20 GB versions. It used the same body style as the first but the hold switch was redesigned.
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The third generation was thinner than the second and third. The third had as high as a 30 GB version. There was a touch wheel as well.
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It replaced the touch wheel with a click wheel. The casing was also slightly slimmer.
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It had a 2.5 inch and 320 by 240 QVGA screen. The click wheel was smaller and was the first to be able to play videos.
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It had slightly thinner bodies. Also, it had dramatically improved battery life.
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It had a 9.7 inch touch screen. Also, it had the capability of accessing Cellular networks.
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It has a lithium-ion polymer battery that lasts up to 10 hours. Available in 16GB, 32GB and 64GB versions.
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It had a 5 megapixel camera on it. Voice dictation was also added.
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It had a Retina Display as well as the third. But it had upgraded components such as the Apple A6X chip and the Lighting connector.
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