Key Features . View wind speed and direction in real time directly on your iPhone or iPadAccess your data history to track wind over timeReceive an alert on your iPhone or iPad when the wind picks upMake life easier by taking into account changes in the windFix it outdoors up to 100 meters from your Weather Station’s indoor moduleRequires Netatmo Smart Home Weather Station (sold separately) The Netatmo Smart Anemometer works with your Netatmo Weather Station* to provide details about wind speed and direction near your home. It also delivers alerts in the event of strong winds and helps you select the best time for your outdoor activities.*Netatmo Smart Home Weather Station required (sold separately). What’s in the Box . Netatmo Smart AnemometerFour AA batteries. .