Life-saving apparatus and instruments, namely, audio hailing devices (AHDs), namely, loudspeakers that emit high-power sound waves for communicating at a distance, audio speakers, bullhorns, megaphones, and amplifiers; communication systems, namely, mobile, portable and handheld electronic devices for transmitting, manipulating, and projection of sound and audio, namely, audio hailing devices (AHDs), namely, loudspeakers that emit high-power sound waves for communicating at a distance, audio ...