The main part of this iPod Shuffle is its battery that is located at the back. its function is to give support energy to this iPod Shuffle to keep operating while it is in use. It's a special type of rechargeable battery that's similar to the kind found in a laptop computer, because it uses lithium to carry electricity back and forth -- a lithium-ion polymer battery. The battery of an iPod Shuffle is connected to a printed circuit board (PCB), which holds together all the different parts of the inside of the device.
the second main part of this thing is its microprocessor. it controls the iPod's functions and randomly selects the songs you listen to. There's also the circular area that take up most of the front, which has five tiny buttons (four on the outside, one in the middle). These are the buttons you press to choose songs when the iPod isn't taken apart -- the left and right buttons skip or replay songs, the top and bottom buttons (the plus and minus signs on the outer case) adjust the volume and the center button plays or pauses the music. There's a hole on one side for a headphone jack, and the other side has two switches: one that turns the iPod on and off and another that turns the Shuffle mode on and off
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