這個燈號問題，實在太多人問了，而說明書和APPLE官網上都寫的清清楚楚。
我來做個小整理，希望一次解決大家的問題。
首先是系統需求：
Microsoft Windows
A PC with a USB port or USB card.
Windows 2000 with Service Pack 4 or later, or Windows XP Home or Professional with Service Pack 2 or later.
iTunes 4.7.1 or later (ships with iPod shuffle). Note: Prior versions of iTunes are not compatible with iPod shuffle, and will not sync music properly.
QuickTime 6.4 or later (ships with iPod shuffle).
Mac OS
A Macintosh computer with built-in USB.
Mac OS X 10.2.8 or Mac OS X 10.3.4 or later (Mac OS X 10.3.6 or later is recommended if connecting iPod shuffle to a low-power USB port, like those found on certain keyboards and non-powered hubs).
iTunes 4.7.1 or later (ships with iPod shuffle). Note: Prior versions of iTunes are not compatible with iPod shuffle, and will not sync music properly.
請Windows用戶看清楚，是要安裝
Service Pack 2
上文轉自APPLE
http://docs.info.apple.com/article.html?artnum=300495
再來是燈號問題：
每一台iPod shuffle都有附上小卡說明，所以可以先參考該小卡。
從來沒有看過該卡的人，或是早將之丟棄的人，請看這裡：
http://www.apple.com/support/ipodshuffle/reference/
該圖轉自APPLE
接著，關於燈號顏色與燈號一直亮著和一直閃著的差別：
Orange and not blinking - not in use, okay to disconnect, charging
You can safely disconnect iPod shuffle from your computer.
Orange and blinking - in use, do not disconnect
iPod shuffle is in use by your computer and should not be disconnected. If you want to disconnect iPod shuffle while in this state, use iTunes to eject iPod shuffle (or quit all applications and eject iPod shuffle from Windows Explorer or the Finder), wait for the status light to stop blinking, and then disconnect iPod shuffle.
Green and not blinking - not in use, okay to disconnect, fully charged
You can safely disconnect iPod shuffle from your computer.
No lights - not in use, okay to disconnect, not charging
You can safely disconnect iPod shuffle from your computer.
上文轉自APPLE
http://docs.info.apple.com/article.html?artnum=300553
最後，關於燈號一直閃著時，是否有在充電？（上段沒有說明）
Here's what the battery indicator colors mean when you press the button:
Green = good charge.
Amber = low charge (also indicates
"charging" when connected to USB)
Red = very low charge
No light = no charge
請注意，你可以看iPod shuffle背後的燈來得知充電情況，但
必須按下背面的按鈕。
上文轉自
http://docs.info.apple.com/article.html?artnum=300499
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蓮井沁雍