Sennheiser MM 400 Black headset

MM400 Passive Noise-Isolating Wireless Bluetooth Stereo Headset The MM 400 is a state-of-the-art Stereo Bluetooth® headset for multimedia mobile phones.
With one press of a button, you can quickly switch between calls and music delivered in superb stereo sound. The invisible high-performance microphone ensures that conversations are clear, making this headset the perfect all-in-one sound solution.