Bio-sensors; biochips; cameras; digital measuring apparatus; sound transmitting apparatus; smartwatches; wireless earphones; speech recognition apparatus; electrical circuits; downloadable multimedia files; headphones; computer operating software; computer operating software for measuring, tracking, and monitoring electroencephalogram (EEG), electromyogram (EMG), electro-oculogram (EOG), and electrocardiogram (ECG); downloadable software for recording and processing in-ear sensor data; downlo...