Stereoscopic equipment for 3D viewing, namely, 3D glasses, batteries for 3D glasses, ear pieces for 3D glasses, nose pieces for 3D glasses, computer software for viewing and creating 3D content, infrared signal emitters and controllers for 3D glasses; battery chargers for 3D glasses; analog and digital equipment used to amplify, modify, combine, process and transport audio signals, namely, amplifiers, power amplifiers, analog and digital audio signal processors, mixers, and crossovers; audio ...