Zany Zappers were daft, like Deely Boppers and were basically just plastic sun glasses with a light emitting diode in the middle of each lense. The Zany Zappers were powered by a PP3 9-volt battery on the end of a length of wire that could be hidden in a pocket. The lights could be flashed to "surprise" anyone who hadn't noticed the plastic/wiring and diode in the middle of your glasses.
Despite their obvious comic potential, Zany Zappers were completely useless to wear as the lights totally blocked your vision. However, they were moderately fun for use in the cinema and good to use as a distraction during that sad part in E.T.!