Command and response units composed of a transmitter/receiver unit, a transmit button operably connected to the transmitter/receiver unit and a vibration device operably connected to the transmitter/receiver unit, which are used to provide a non-sound means for communication in an environment in which a user has an inability to hear due to noise or hearing impairment, the units being mountable to headwear, namely, helmets, hardhats, caps, headbands, hats and visors, and clothing

'button':12 'cap':68 'cloth':74 'command':1 'communic':40 'compos':5 'connect':14,24 'devic':22 'due':53 'environ':43 'hardhat':67 'hat':70 'headband':69 'headwear':64 'hear':52,57 'helmet':66 'impair':58 'inabl':50 'mean':38 'mountabl':62 'name':65 'nois':55 'non':36 'non-sound':35 'oper':13,23 'provid':33 'respons':3 'sound':37 'transmit':11 'transmitter/receiver':8,17,27 'unit':4,9,18,28,60 'use':31 'user':47 'vibrat':21 'visor':72

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