Meet the BluOS upgrade kit – a small device that easily connects to the USB input of your BluOS ready NAD amplifier or receiver and lets you stream all your music with one easy-to-use app. Once set up and connected to your Wi-Fi network, you can simply use the BluOS Controller app for smartphone, tablet, and desktop to stream & control lossless music, or group with other BluOS enabled devices like wireless speakers, and add high-resolution sound to any room in your home.