The invention relates to polyamide sheet silicate compositions, containing an untreated clay mineral and a water-soluble polyamide, the concentration of the clay material being greater than 30% by weight. The device can be a photovoltaic module that includes other power generating system components\u2014including control units and associated powersignal wiring\u2014within the fa\xe7ade. The optical transmitters transmits the optical signals within a predetermined bandwidth. The bending member can be switched between curved states inversed to each other while generating sound, so that switching can be performed between a closed state of a distal end of the temple and an opened state of the distal end thereof.