The invention relates to headphones which can facilitate the transfer of electrical power from the headphones’ internal power source to other devices. The fine-grained metallic material has an average grain size of 2 nm to 5,000 nm, a thickness between 25 micron and 5 cm, and a hardness between 200 VHN and 3,000 VHN. The poke-through assembly includes at least one intumescent member, a base plate and an intumescent enclosure. The tubular shaft extends substantially orthogonal to the anchor frame when biased to the operating position.