Sennheiser MM 100 Bluetooth Headset - Black/Gray Wireless freedom-Stereo Bluetooth guarantees hands-free convenience and optimized hi-fi stereo sound. ^ Outstanding Sennheiser sound. ^ Open acoustics-deliver a wide dynamic range with detailed and natural sound reproduction. ^ Invisible micrphone-for clear conversations ^ Easy headset controls-seamlessly blend in with the neckband style. Wireless freedom-Stereo Bluetooth guarantees hands-free convenience and optimized hi-fi stereo sound. Outstanding Sennheiser sound. Open acoustics-deliver a wide dynamic range with detailed and natural sound reproduction. Invisible micrphone-for clear conversations Easy headset controls-seamlessly blend in with the neckband style.