Saga How do Boba Fett and other Star Wars characters fire weapons without using their hands?

In the Star Wars Universe, how does a bounty hunter (such as Boba Fett) use their gauntlet weapons without touching the buttons to launch it? For instance, they shoot wires/darts etc., but their hands are not seen near the button.

 

Could be non-hand muscle flexion, vocal (or subvocal) commands, brain waves (?)...

 

Boba Fett does use his hand. I can't recall if Jango does, but if he doesn't, it's probably done through some subtle wrist or hand motion.

 

Similar to that rig Travis Bickle uses in Taxi Driver:

 

Jango uses his right hand to activate the flame thrower that he uses on Mace. But he doesn't use his hands for his jet pack missile, but I believe there's something in the helmet that would allow that, through the movement of his eyes or some such. Boba uses the same type of cable that Jango did to bind Luke as he did Obi-wan. Boba also attempts to activate a blaster on his wrist when Han hits his jet pack and sending him into the sail barge.

 

I use to have the same question, till I saw AOTC, and looked at how advance their system were in clearer light, and just concluded that the helmet gave some sort of signal to the weaponry.