Personal anti-noise and anti-sound protection devices, namely, noise-cancelling personal headphones, personal headsets [, sound amplifiers, audio amplifiers, loudspeakers and audio speakers ] ; headphones; communication apparatus for headsets, namely, microphones [, digital voice recorders, acoustic receivers, vibration receivers and radio frequency receivers ] ; headsets for use with computers, music players, televisions, video games consoles, phones, smart phones, tablet computers and smart...