function ENT:SetELS(on)
    if on == self:GetELS() then return end
    if self.v.IsScar then
        if self.v.SirenIsOn == nil then return end
        if not self.v.SirenSound then return end
        if on then self:SetHorn(false) end
        self.v.SirenIsOn = on
        self.v:SetNWBool("SirenIsOn", on)
        if on then
            self.v.SirenSound:Play()
        else
            self.v.SirenSound:Stop()
        end
    elseif self.v.IsSimfphyscar then
        local dt = on and 0 or .5
        self.v.emson = not on
        self.v.KeyPressedTime = CurTime() - dt
        numpad.Deactivate(self, KEY_H, false)
    elseif vcmod_main and vcmod_els
    and isfunction(self.v.VC_setELSLights)
    and isfunction(self.v.VC_setELSSound) then
        self.v:VC_setELSLights(on)
        self.v:VC_setELSSound(on)
    elseif Photon
    and isfunction(self.v.ELS_SirenOn)
    and isfunction(self.v.ELS_SirenOff)
    and isfunction(self.v.ELS_LightsOff) then
        if on then
            self.v:ELS_SirenOn()
        else
            self.v:ELS_SirenOff()
            self.v:ELS_LightsOff()
        end
    end
end