Method, device, and system of an earphone having increased comfort through external-facing charging connections, enhanced controls through direction and/or motion evaluation, and/or accurate physiological feature extraction through audio-motion sensor correlation

Abstract

Disclosed are a method, a device, and/or a system of an earphone having increased comfort through external-facing charging connections, enhanced controls through direction and/or motion evaluation, and/or accurate physiological feature extraction through audio-motion sensor correlation. In one embodiment, an earphone includes a housing, a speaker configured to audibly coupled to an ear canal, a battery, a wireless antenna, and a charging connector. The inside face of the housing faces inward toward a concha of the ear, and the outside face faces outward when the earphone is seated in the ear such that at least an exposed region is unobstructed to a finger of the user. The charging connector of the earphone is electrically coupled to the battery and positioned on the outside face of the housing to prevent contact with the ear, reduce corrosion of the charging connector of the earphone, reduce dirt buildup, and/or improve comfort.