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If you want a little music to your ears, these plug in speakers are portable and give a clear signal to your iPod. This Plug In & Enjoy speaker is just a concept right now, but I could definitely see it on store shelves in the future. Once plugged in you turn the front part of the speaker (which acts like a knob) until if finds the signal coming from your music player. Once the signal is located an LED light will turn green. If it has found the correct station simply wait 3 seconds until the LED turns red at which point the knob will control the volume instead. I love the fact that you can use several of these to get the music to fill a room if needed.
Image Source: http://www.ohgizmo.com/2006/12/19/plug-in-enjoy-speakers/