The A3144 Hall magnetic sensor module detects magnetic fields. When there is no field, the signal line is HIGH. When there is detection, it becomes LOW. An LED light indicates the detection. This sensor operates on 5V. The current consumption is low: 3mA at rest and 8mA when switching. The module operates from -40 to 90°C. The dimensions are small: 20x16 mm. The digital output is a Hall effect sensor. This sensor detects both magnetic poles. The output voltage is equal to the operating voltage. The operating temperature ranges from -40°C to 85°C. The switching time is fast: 2 μsec. The module has reverse polarity protection.