Acoustic couplers; electronic devices being remote control apparatus for remotely controlled headset and sound receivers; audio- and video-receivers; audiovisual teaching apparatus in the nature of digital devices, namely, sound insulation headsets and sound receivers; cordless telephones; wearable digital devices in the nature of connected bracelets; measuring instruments, namely, instruments for measuring acoustic levels; measuring apparatus, namely, apparatus for measuring acoustic levels;...

Microphones

Acoustic couplers; electronic devices being remote control apparatus for remotely controlled headset and sound receivers; audio- and video-receivers; audiovisual teaching apparatus in the nature of digital devices, namely, sound insulation headsets and sound receivers; cordless telephones; wearable digital devices in the nature of connected bracelets; measuring instruments, namely, instruments for measuring acoustic levels; measuring apparatus, namely, apparatus for measuring acoustic levels;...