A decorative wireless earphone is a single piece integrated with a necklace, a microphone, a main unit and an earpiece. In one embodiment, a symmetric inducting device for an integrated circuit comprises a substrate, a main metal layer and a shield. The pockets each carry an arm which is pivotal from a first position within the pocket to a second position partially outside the pocket. The carrier includes a carrier bottom, a plurality of metal contacts, and a carrier lid attached to the carrier bottom. Another filter may be a narrow band optical filter, such as a dichroic notch filter. At least one of each of track grooves of an outer joint member and each of track grooves of an inner joint member is formed by cold-forging finishing.