What's the difference between silver and black 3D-NLS health analyzer?

We have three different 3D-NLS item.
Silver 3D NLS using the oxbox ( aluminum box ) this one cost a lot so price higher.
Black 3D NLS same as silver one
Mini 3D NLS use the new technology to make more portable appreance, so save cost.
Actually 3 item same in function just different in apprearance.
About details detecting procedure please view vedio on you tube: http://youtu.be/-3895xkuRX8


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