Voltage of power switch and power led

I am building a new pc,using some customized power switch and power led.But wondering what voltage of the front panel pins.Also different website listed different voltage,some got 3.3v,some got 5v.I am afraid it will kill my motherboard when I use the wrong switch or led.
So anyone have any idea the what is the voltage of the power switch and power led take?
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    Normally 5V ,but it doesn't really matter as any momentary action switch will work without damaging motherboard or switch and a 5V LED will work happily at 3.3V.
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