What object is for MouseMoved?

Question: What object must be used for this? -

local TLB = P.Bottom.Power.Lever

(and its children and/or parents)

Here's the script associated with it (and its children) for it to function:

TLB.MouseMoved:connect(function(screenX, screenY)
    if (leftButtonDown) then
        local oldY = TLB.Lever.Position.Y.Offset + 10
        local newY = math.ceil((screenY - TLB.AbsolutePosition.y - 36) / 10)
        newY = math.max( math.min( 8, newY), 0)
        if ((newY * 10) ~= oldY) then P.Click:Play() end
        TLB.Lever.Position = UDim2.new(0, 0, 0, newY * 10 - 10)
        local ratio = 1 - (newY / 8)
        throttle = ratio
    end
end)

I'm not too sure of how this script is supposed to function, but based on my observation, when the mouse is left clicked then the "lever" will move up or down, please correct me if I'm wrong.