There were at least two versions of the Handlink during the running of Quantum Leap. The first version, introduced in the first episode of the series, "Genesis", was flat, was about 1/4 inch thick, seemed made of translucent black plastic, had black data screens, and had a few buttons. The second version, first seen in "The Right Hand of God", is thicker, made fully of black plastic, has more screens or lights, and more bright buttons. It had silver strips at top and bottom and red flashing graph like bars lights near the center.