Sound level meters; sensors; noise filters; noise suppression apparatus; audio noise reducers; noise-canceling headphones; noise suppressors [electrical components]; low noise level converters; instruments for reducing noise in systems for recording audio signals; acoustic transformers; apparatus for wireless transmission of acoustic information; gauges; electrical limiters; signal limiters; vibration meters; transducers; software; software for noise cancelation; downloadable computer software for data transmission; measures; noise meters; acoustic meters; vibration meters; digital sound processors; surround sound processors; analog sound modifiers; multi-channel sound processors; sound level meters; sound location instruments; sound reverberation units; apparatus for sound processing; sound recording discs; sound, data or image transmission apparatus; microphones; dosage dispensers; acoustic limiters; acoustic pressure sources; insulation testers; data transmission networks; apparatus for transmitting data; downloadable mobile applications for data transmission; wireless communication devices for the transmission of voice, data or images; computer hardware for remote access and transmission of data; measuring apparatus and instruments; inspection apparatus and instruments; sound, image or data recording, transmission, reproduction or processing apparatus and instruments; blank digital or analog recording and storage media; computers and computer peripherals.