Kestrel DROP® Wireless Environmental Data Loggers are small, rugged, waterproof and accurate. The Kestrel DROPs allow you to record and monitor the conditions of any environment, while easily accessing and charting real-time data on a smart device. The DROPs can be placed in multiple locations (inside, outside and even in water) to log specific environmental conditions and transmit data via Bluetooth® SMART to an iPhone, iPod or iPad (generation compatible).