The Hella ABS Wheel Speed Sensor - 012679441 is a component used in automotive anti-lock braking systems (ABS). It is designed to detect the rotational speed of each wheel and send this information to the ABS control module. This allows the system to monitor the speed of each wheel and adjust braking pressure accordingly to prevent wheel lock-up and maintain vehicle stability. The sensor is made by Hella, a trusted manufacturer of automotive parts, and is designed to meet OE specifications for a reliable and accurate performance.