Earphones and headphones; Electric audio playback units with lights and speakers; Electronic circuits; Electronic devices for locating and tracking lost articles, people, pets, using radio frequency, global positioning systems, cellular communication networks; Luminous variable/dynamic signs using light emitting diodes and electronic controllers to produce real-time and programmable messages and information displays; Personal stereos; Portable media players; Portable wrist-mounted digital electronic device for audio recording and audio playback; Smartwatches; Wearable activity trackers

'activ':74 'articl':21 'audio':5,67,70 'cellular':30 'circuit':13 'communic':31 'control':42 'devic':15,65 'digit':63 'diod':39 'display':53 'earphon':1 'electr':4 'electron':12,14,41,64 'emit':38 'frequenc':26 'global':27 'headphon':3 'inform':52 'light':9,37 'locat':17 'lost':20 'lumin':33 'media':57 'messag':50 'mount':62 'network':32 'peopl':22 'person':54 'pet':23 'playback':6,71 'player':58 'portabl':56,59 'posit':28 'produc':44 'programm':49 'radio':25 'real':46 'real-tim':45 'record':68 'sign':35 'smartwatch':72 'speaker':11 'stereo':55 'system':29 'time':47 'track':19 'tracker':75 'unit':7 'use':24,36 'variable/dynamic':34 'wearabl':73 'wrist':61 'wrist-mount':60

TILPHI

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