| http://www.w3.org/ns/prov#value | - Ease of fitting and low inventory, or one-size-fits-all without requiring a multitude of adjustments. (Multiple adjustments in position and angle of the speaker are mandatory if the speaker is to be at or very near the ear, as in prior devices, such devices being prone to slip and get out of adjustment especially while the user is active, such as while biking.) In the present invention, the speake
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