The BiVVol RVR-325 (Bith Vehicle Voice Lock) device was a computer module and locking system tied into a vehicle's main control computer and cross-linked to the main drive control package. A hand-held voice recognition link was used to program a series of syllables into the deterrent control program. It was difficult to forge this code. A failed attempt to fool a BiVVoL resulted in a computer lock-out until proof of the owner was established through a second identification system.

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