Megavisor

The Megavisor feature is the Predators' main gimmick. Represented in the accompanying fiction as a means to further enhance their targeting systems, in toy form the Megavisor is in essence a form of slide viewer.

Each of the smaller Predator jets (Falcon, Skydive, Talon and Snare) has a panel which can be flipped down from their vehicle mode's undercarriage. When the jet is attached to the tail of Skyquake's jet mode, or to Stalker's ICBM, you can look through the eyepiece to see a slide image, representing the target lock of the jet in question. Skyquake and Stalker also have their own slides when not interfacing with a smaller jet.

From Teletraan I: The Transformers Wiki, a Wikia wiki.