public function applyConclusiveMatch($userAgent)
    {
        if (WURFL_Configuration_ConfigHolder::getWURFLConfig()->isHighPerformance()) {
            //High performance mode
            $tolerance = WURFL_Handlers_Utils::firstCloseParen($userAgent);
            return $this->getDeviceIDFromRIS($userAgent, $tolerance);
        } else {
            //High accuracy mode
            return $this->getDeviceIDFromLD($userAgent, 5);
        }
    }