Brief description
All Wakandans wear Kimoyo beads around their wrists, and one of their functions is to allow distance communication with holographic images.
First occurrence: As Prince N'Jobu is planning a robbery in an apartment in Oakland, USA in 1992, King T'Chaka arrives, and explains that Wakanda is in trouble due to Ulysses Klaue having stolen a quarter ton of vibranium, as well as having killed many people in his escape. As he explains this, he holds up his wrist, which has a device strapped to it that projects a holographic display first of the head and torso of Ulysses Klaue, then of the vibranium he stole, then of the bomb exploding.