Acoustic alarms; Communications headsets for use with communication radios, intercom systems, or other communications network transceivers; Earphones and headphones; Intercoms; Internet radios; Loudspeakers with built in amplifiers; Loudspeakers, headphones, microphones and CD players; Microphones for communication devices; Mobile radios; Pagers; Portable emergency intercoms; Portable sound reproducing apparatus; Public address systems; Radio-frequency receivers; Radio-frequency transmitters;...