The Ultrasone SIRIUS is a Bluetooth adapter designed for the Performance Series headphones including the 820, 840, 860, and 880. The adapter is curve-shaped to cling precisely to the shape of the headphone and attaches to the cable input on the earcup. With a weight of only 12 grams, the adapter is inconspicuous and comfortable to wear.

The Bluetooth technology incorporates the aptX codec for high-quality, lossless audio streaming. Specially-adapted headphone amplifiers provide the drivers with a strong, clear signal, ensuring an exciting musical experience. The adapter offers three buttons for easy operation including volume up, volume down, and a play/pause button. An integrated microphone enables the use of Performance headphones as a headset for making calls with a smartphone or tablet, or for wireless communication when gaming. Thanks to the high-performance battery, the SIRIUS can be operated continuously for up to 12 hours and includes a USB charging cable.