Wrist computron
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A wrist computron is a portable device carried by Troy and Dillon during their first adventures on the newly-discovered Earth.
The complete features of the wrist computron are not defined, but the device has four basic functions: communication, translation, data storage/retrieval and scanning capabilities.
Invisibility field
The feature of personal invisibility, or the invisibility field, is devised by Doctor Zee after the discovery of Earth. He first demonstrates the invisibility field on a Viper on a launch platform, explaining beforehand that "each color and sound has its own frequency, some of which are too high to be perceived by the human eye or ear" and that by generating a "nuclear field in a frequency above the perception of Earth's conventional electronic equipment or even the human eye" whole ships or personnel can be rendered invisible.
The power cost, however, is too high for this to be used in all applications, and thus must be used only in "life or death" situations (Galactica Discovers Earth, Part I).
One feature, personal invisibility, is used by Willy to torment a bully, Tucker (Galactica Discovers Earth). Later, the invisibility feature is used by Troy and Dillon to avoid questioning by the Federal Bureau of Investigation after thwarting a hijacking attempt on an commercial air plane (The Night the Cylons Landed, Part I).
Those using the invisibility field emitted by the device cannot see others who are also invisible using the same device; Troy and Dillon hold hands while quickly exiting the plane so as to remain in close proximity during their escape (The Night the Cylons Landed, Part I)
Other uses
It is also used by Dillon to translate Earth terms he does not understand, in addition to providing information on the many aspects of Earth, including its locations and organizations (The Night the Cylons Landed, Part I).