Wireless heart rate monitor for Samsung galaxy S4/Note 3/Nexus 5 using Android 4.3 Adjustable Soft fabric Chest strap is waterproof (IPX7) and has a comfortable fit Tracks heart rate, distance, pace, and more! Compatible with Android Fitness apps using BLE (Bluetooth Low Energy) Technology For more information on apps see the manufacturers FAQ at [url=https://www.jarvmobile.com/faq.asp ]404 – File or directory not found.[/url]