9
3D spectacles; accelerometers; acoustic [sound] alarms; acoustic couplers; audio- and video-receivers; audiovisual teaching apparatus; azimuth instruments; binoculars; camcorders; cameras [photography]; compasses [measuring instruments]; computer programmes [programs], recorded; computer operating programs, recorded; computer peripheral devices; computer software, recorded; computer programs [downloadable software]; computer software applications, downloadable; computer hardware; data processing apparatus; directional compasses; distance measuring apparatus; distance recording apparatus; apparatus for recording distance; electronic pocket translators; Global Positioning System [GPS] apparatus; goggles for sports; hands-free kits for telephones; headphones; intercommunication apparatus; interfaces for computers; levels [instruments for determining the horizontal]; magnifying glasses [optics]; microphones; monitoring apparatus, electric; navigational instruments; observation instruments; optical apparatus and instruments; optical character readers; range finders; telemeters; scanners [data processing equipment]; smartglasses; sound recording apparatus; sounding apparatus and machines; spectacles [optics]; eyeglasses; personal stereos; stereoscopes; stereoscopic apparatus; sunglasses; telephone receivers; telephone apparatus; telephone transmitters; telescopes; time recording apparatus; transmitters of electronic signals; transmitters [telecommunication]; video recorders; video telephones; wearable activity trackers