Headphones; earbuds; earphones; PC audio speakers; USB audio speakers; amplifiers; wireless indoor and outdoor speakers; headphones for children; audio mixers; audio speakers; audio speakers for earphones; audio speakers for headphones; audio headphones; microphones; computer docking stations; audio-visual cables; audio cables; protective cases for audio equipment in the nature of headphones and earphones; display screen protectors for providing shade and privacy specially adapted to electronic devices, namely, laptops, cell phones, and personal digital assistants; computer cables; biofeedback headphones; wearable electronic devices, namely, headphones and wristbands specially adapted for mobile phones, computers, tablets and watches to measure and adjust sound, biofeedback and ambient noise, measure and record movement, measure and record physiological and biological traits of users, and measure temperature in various environments; downloadable software for use in conjunction with headphones and wearable devices to measure and adjust sound, biofeedback and ambient noise, measure and record movement, measure and record physiological and biological traits of users, and measure temperature in various environments