Sennheiser MM 450-X Headband Wireless Headphones - Blue for sale online | eBay
Sennheiser MM 550-X and MM 450-X - Austin, TX - $100 and $85: ImagesOfTexas
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Li-Polymer-battery - 270mAh (3.7V) - for wireless headset, headphones Sennheiser MM 450-X Travel - Electropapa
Sennheiser MM 450-X Wireless Review - RTINGS.com
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Sennheiser MM 450-X Wireless Review - RTINGS.com
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Sennheiser MM 450-X Headband Wireless Headphones - Blue for sale online | eBay
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Review: Sennheiser MM 450-X headphones combine noise cancelation and Bluetooth | TechHive