![Sennheiser MM 400 Bluetooth® stereo headset with built-in microphone and hands-free operation at Crutchfield Sennheiser MM 400 Bluetooth® stereo headset with built-in microphone and hands-free operation at Crutchfield](https://images.crutchfieldonline.com/ImageHandler/trim/750/457/products/2011/20/143/g143MM400-o_folded.jpeg)
Sennheiser MM 400 Bluetooth® stereo headset with built-in microphone and hands-free operation at Crutchfield
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![Sennheiser MM 400 Bluetooth® stereo headset with built-in microphone and hands-free operation at Crutchfield Sennheiser MM 400 Bluetooth® stereo headset with built-in microphone and hands-free operation at Crutchfield](https://images.crutchfieldonline.com/ImageHandler/trim/620/378/products/2011/20/143/g143MM400-o_folded.jpeg)