Need some help about UNIT_POWER

[devilArt]

edit: so my question is how can i make low mana alert only plays when I'm on mage/warlock/priest/paladin, and disable low mana alert when I'm on dk/rouge/warrior/hunter?

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I use this code to play a alert sound when I'm low health or mana
but how can I disable low mana alert when I'm playing DK?

local lowHealth = .2
local lowMana   = .3
 
local playedHp, playedMp
local f = CreateFrame("Frame")
f:SetScript("OnEvent", function(self, event, unit, pType)
    if unit ~= "player" then return end
    if event == "UNIT_HEALTH" or event == "UNIT_MAXHEALTH" then
        if UnitHealth("player") / UnitHealthMax("player") < lowHealth then
            if not playedHp then
                playedHp = true
                PlaySoundFile("Interface\\AddOns\\media\\LowHealth.ogg")
            end
        else
            playedHp = false
        end
    elseif event == "UNIT_POWER" or event == "UNIT_MAXPOWER" and pType == "MANA" then
        if UnitPower("player") / UnitPowerMax("player") < lowMana then
            if not playedMp then
                playedMp = true
                PlaySoundFile("Interface\\AddOns\\media\\LowMana.ogg")
            end
        else
            playedMp = false
        end
    end
end)
 
f:RegisterEvent("UNIT_HEALTH")
f:RegisterEvent("UNIT_POWER")
f:RegisterEvent("UNIT_MAXHEALTH")
f:RegisterEvent("UNIT_MAXPOWER")