The Em221 Weather+ is the perfect indoor/outdoor temperature monitor for any room in your home and the outdoors. Pair your smart device to the Em221 with the Weather+ app enabling you to monitor the temperature of your local environment and receive push notifications right to your smart device. The Weather+ sensor can store data for up 20 days, automatically connecting to your smart device when within range. The data history graph is clearly displayed on the App in 15-minute intervals.