Music headphones; Sound alarms; Sound amplifiers; Sound bars; Sound boards; Sound cards; Sound equalizers and crossovers; Sound level meters; Sound mixers; Sound mixers with integrated amplifiers; Sound projectors; Sound projectors and amplifiers; Sound recording and sound reproducing apparatus and instruments; Sound reproducing apparatus; Sound reproduction apparatus; Sound transmitting apparatus; Acoustic sound alarms; Digital music system that synchronizes digital music files stored on a h...