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Be alerted whenever conditions approach critical—24 hours a day, 7 days a week. Choose e-mail for detailed information on alarm conditions, plus regularly scheduled updates on current weather conditions. Or choose the phone alert, with a special alarm tone alerting you to check your weather station or WeatherLink for more details. (Because systems vary, the phone alert may not work outside the USA). Optional software module for use with WeatherLink models 6510SER, 6510USB, 6540, 6550, 6560, or 7862. Not for use with WeatherLink for Mac. Compatible with Vantage stations.