It is an A/C electric generator that creates its own a/c voltage. It puts out ac pulses on a frequency that the ABS computer monitors. When you go faster it puts out a higher frequency and is translated to the speed of the wheel. When a wheel skids or stops, the computer senses that and goes into anti-lock mode.
You have one at every wheel, but on some trucks you have RWAL or rear wheel anti-lock and have only one sensor on the rear end. They sense the rear wheels only not one on each wheel.
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