[ Recorded computer software for digitally enhancing sound recordings; speaking tubes; telephone receivers; transmitters of electronic signals; radios; intercommunication apparatus, namely, cellular telephones; ] radiotelephony sets; telephone apparatus; [ telephone transmitters; walkie-talkies; hands free kits for phones; acoustic conduits; acoustic membranes; loudspeakers; ] microphones; [ sound transmitting apparatus; acoustic couplers; ] headphone, namely, headsets for telephones