Scientific, nautical, surveying, photographic, cinematographic, optical, weighing, measuring, signaling, checking, supervision, emergency life-saving and teaching apparatus and instruments, namely, wearable electronic wristbands, bracelets, wrist straps and smartwatches equipped with loudspeakers, motion sensors and motion-to-sound transducers being electronic transducers for converting motion to sound, all of which function as body instruments used to make sound; apparatus and instruments for conducting, switching, transforming, accumulating, regulating and controlling electricity, namely, wearable electronic wristbands, bracelets, wrist straps and smartwatches equipped with loudspeakers, motion sensors and motion-to-sound transducers being electronic transducers for converting motion to sound, all of which function as body instruments used to make sound; apparatus for recording, transmission or reproduction of sound or images; magnetic recording media in the nature of blank magnetic data carriers, blank recordable sound recording disks; blank recordable compact disks, blank recordable DVDs and other digital recording media, namely, blank optical disks, blank sound recording carriers being blank recordable compact discs and blank magnetic data carriers; mechanisms for coin-operated apparatus; cash registers, calculating machines, data processing equipment in the nature of electronic devices for the digital transformation of detected motion into audible output; computers; downloadable computer software for sound processing and movement detection and downloadable software for sensor operation; fire extinguishers