The Kestrel DROP D2 data logger can be placed wherever needed to log temperature and humidity with the data logs retrieved wirelessly and automatically to the Kestrel LiNK app when within wireless range(up to 100’ or more line of sight).It is the easiest way to monitor and track temperature, humidity, heat index and dew point in almost any environment – wet or dry, indoors or out.You can view data wirelessly via Bluetooth Smart on your iOS or Android phone or tablet with the free Kestrel LiNK app. Store thousands of data points and get months of logging on a single coin-cell battery - customize logging rate, connections and alerts.See, save and share data from multiple DROPs with just one phone or tablet.Works oniOS 6 installed iPhone 4s, iPad 3rd generation or later,Android 4.3 and higher. Works with most Android devices with Bluetooth Smart®, including Samsung Galaxy, Nexus 4, Motorola Droid and other recent generation phones and tablets.