Adapter cables for headphones; Apparatus for recording, transmission or reproduction of sound; Apparatus for wireless transmission of acoustic information; Ear buds; Earphones; [ Headphones; ] Horns for loudspeakers; [ Loudspeakers; ] Portable media players; Smartwatches; USB cables for cellphones; USB charging ports; Wearable activity trackers; [ Wireless chargers; ] Wireless headsets for smartphones

'acoust':18 'activ':40 'adapt':1 'apparatus':5,13 'bud':21 'cabl':2,33 'cellphon':35 'charg':37 'charger':43 'ear':20 'earphon':22 'headphon':4,23 'headset':45 'horn':24 'inform':19 'loudspeak':26,27 'media':29 'player':30 'port':38 'portabl':28 'record':7 'reproduct':10 'smartphon':47 'smartwatch':31 'sound':12 'tracker':41 'transmiss':8,16 'usb':32,36 'wearabl':39 'wireless':15,42,44

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