Check the listing for details. 2x A3144 HALL EFFECT SENSOR A3144 A3144E Allegro Contactless Switch. Condition: New: Never Used. Listed at 2.98 USD. dewabit A3144 HALL EFFECT SWITCH This Auction is for a LOT of 2 - A3144 HALL EFFECT SENSORS Features: Superior Temperature Stability for Automotive or Industrial Applications 4.5 V to 24 V Operation … Needs Only An Unregulated Supply Open-Collector 25 mA Output … Compatible with Digital Logic Reverse Battery Protection Activate with Small, Commercially Available Permanent Magnets Solid-State Reliability Small Size Resistant to Physical Stress Some Uses: Rotational Position Sensor Linear Motion Position Sensor RPM Sensor Switch Spark Timing Sensor Linear End Stop Sensor Stepper Motor Zero Point Sensor Video Player Capstan Motor Self Calibration Sensor Any Function Where a Magnetic Field needs to Activate a Switch LINK to DATASHEET