Earphones; headphones; microphones; headsets for mobile phones; headsets for computers; headphones with a built-in microphone or built-in microphones; computer application software for mobile devices, laptop computers, desktop computers, tablet computers, namely, application software for measuring ear canal transfer function (ECTF) and head-related transfer function (HRTF) of individuals; mobile devices, namely, mobile computers, mobile phones, smartphones, tablet computers; electric adapters...