How do these pieces of Predator equipment work?

Question

I was wondering if anyone could tell me:

• How the Predators Plasma Caster works.
• How the Bio Mask changes vision modes.
• Finally how the Wrist Blades and Combi-Stick extend and retract.

Answer 1

According to the Predator Wikia the "Plasma Caster" is based on eye-tracking technology. The gun itself is shoulder-mounted and can be fired either using the wrist gauntlet or by some kind of hidden signal (such as a button inside the Biomask).

The Bio-mask is a combination breather, video recorder and targeting system for the Plasma Caster. The various vision modes include EM, Infra-red (easily fooled by mud) and UV. The modes are themselves controlled from the Predator's gauntlet.

The Wrist Blades extend from sheaths that mount to the wrist. They're controlled by a button on the side of the wrist. In addition to acting as melee weapons, they can also be explosively fired at enemies

The Combi-Stick is a lightweight weapon that telescopes to form a spear-like object that can either be used as a pike or thrown at an opponent. They have an LED-lit button on the side that seems to activate the extension mechanism