Molded external case for portable phones with extra battery holder and buttons that activate push-to-talk (PTT) functionality provided by downloadable software installed on the portable phone; cases that removably attach to portable phones to hold additional battery and provide control buttons to enable two-way PTT functionality; portable phone case and downloadable software that converts a phone into a multi-channel PTT handset

'activ':14 'addit':39 'attach':33 'batteri':9,40 'button':12,44 'case':3,30,54 'channel':66 'control':43 'convert':59 'download':23,56 'enabl':46 'extern':2 'extra':8 'function':20,51 'handset':68 'hold':38 'holder':10 'instal':25 'mold':1 'multi':65 'multi-channel':64 'phone':6,29,36,53,61 'portabl':5,28,35,52 'provid':21,42 'ptt':19,50,67 'push':16 'push-to-talk':15 'remov':32 'softwar':24,57 'talk':18 'two':48 'two-way':47 'way':49

SMARTPTT

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