In Pairs help?

So what I'm trying to do is make the Pair transparent, then nontransparent after 1 second. Apparently It's only making that loop to the 1st Brick, not the 2nd Brick.

button=script.Parent
siren=game.Workspace.siren:GetChildren()

function onClick()
	for i=1,10 do
		for o,p in pairs(siren) do
		siren[o].Transparency=1
		end
                wait(1)
		for o,p in pairs(siren) do
		siren[o].Transparency=0
		print(i)
end end end

button.ClickDetector.MouseClick:connect(onClick)

What I'm trying to figure out is how to get the 2nd Brick to do what the 1st Brick is doing > (which In Pairs should do automatically....) Help would be appreciated!

The script has an error because not everything in your work space will have the transparency property thus the script will not work. I suggest watching Peasfactory tutorial on tables on youtube it will explain the answer in more depth