The Nx Head Tracker for Headphones from Waves is a small Bluetooth device that latches on to your headphones and tracks your head movements in 360° to augment the 3D audio experience. It can be used to experience music, movies, and games, in 3D audio on several devices such as computers, tablets, or mobile devices using any set of headphones.
Use the Nx Head Tracker with the Nx 3d audio app or the Virtual Mix Room plug-in. It requires a standard AAA battery and provides approximately 40 hours of power. It will go to sleep automatically after a short while if it's not connected or not moving. Bluetooth 4.0 BLE (Bluetooth Low Energy) is also required.