After using the device for a month, the red LED would not go out, resulting in the battery draining. Sennheiser was kind enough to return the device and send me a new one. The new one has the exact same problem and the batter drains in less than 20 minutes. This time Sennheiser sent me a "HD1" device that seems to work fine. I would stay away from this "HD1 Free" device as there must be major quality or production issues.
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