Android does not give offline speech recognition

My tablet is an Android 4.4 KitKat intel atom and 1GB of RAM , im install google now latest version . I never see the option , use voice recognition offline, Not appear on menu, where it should be the option simply is not , and disconcerts me , I'm an electronic engineer and I'm doing a giant robot and I need that option in the tablet,I 'm programming in app inventor and need my tablet have that option. since it only works for me with internet connection. Im spanish excuse me for my english

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