I strongly assume that "switching on the shoe" is supposed to represent the activation of an ultrasound device. read more
Audiences have a basic knowledge that bats use ultrasound for navigation and hunting, and so they subconsciously accept that Batman calls them for support - even if that may not be a scientifically viable way to do so. read more
It seems like for every situation Batman finds himself in, he has a gadget ready to deal with it. And that is exactly why this character has endured for over 70 years. He wasn't born with super powers, and he wasn't bitten by a radioactive bat; instead he uses his tech resources to help him win his war on crime. read more