If you're wondering what the heck a Hall-effect keyboard is, well, let me tell you. As a recap, when you press a key on a typical computer keyboard, you compress a rubber dome with a metal contact on the bottom, completing a circuit and registering a key. Mechanical keyboards use a spring mechanism instead of a rubber dome to to reset the key, but they still rely on two metal contacts touching to register a keypress.
Hall-effect keys are frictionless in operation. That means no physical contact is required between the key itself and the switch element. They achieve this by making use of the Hall effect, a shift in a wire's voltage caused by a magnet affecting it. Essentially, the voltage is measured across a wire at a specific point, and when you depress the key, the magnet changes the value, registering a keystroke. This technology is used often in simulator gear like joysticks and steering wheels.
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Originally Posted by Hans de Vries
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