HD 4.50BTNC/HD 4 - Sennheiser

X Only make calls with the headphones in locations where Bluetooth is permitted. The HD 4.50BTNC/HD 4.50R Wireless headphones comply with the Bluetooth 4.0 standard. In order that data can be transmitted wirelessly using Bluetooth, you have to pair your headphones with a compatible Bluetooth device that sup-Headset Profile (HSP) NFC.

  Bluetooth