The E57-18LE20-B1D is a compact, inductive sensor manufactured by Eaton. It features a PNP/NC output configuration, a sensing range of 0-20mm, and an operating voltage of 6-48V DC. It is an M18 size with mounting thread and has a robust and reliable design. The sensor is resistant to water, dust, and vibration, making it suitable for a wide range of industrial applications and automatic assembly equipment. The sensor is also compatible with multiple sensor technologies, including capacitive, magnetoresistive, optical, and ultrasonic.