Now a fast, effortless gesture yields results and provides an automatic sync with the dedicated app. In app you can track temperature readings, get reminders, and input related symptoms & medications for advice right on your smartphone.Storage conditions :Temperature: -25°C to +55°C (-13°F to 131°F) Humidity: Between 15% and 95% ; Power supply :2x 1.5V LR03 AAA alkaline cells ; Operating environment Temperature: 10°C - 40°C (50°F - 104°F) Humidity: Between 15% and 95%