The D'Addario Humidikit all-in-one maintenance and monitoring system gives you everything you need to ensure your instruments stays safe and playable. It includes the Humiditrak with Bluestream technology to provide a constant stream of temperature, humidity, and impact data directly to your smartphone via Bluetooth. It also contains a Humidipak Starter Kit, featuring two-way automatic humidity control technology to maintain the ideal humidity level inside your instrument case. Whether your instrument is across the country or at your fingertips, you can rest assured the Humidikit is giving your instrument the complete care it deserves.