The Omron E2A-M08KS02-M1-B2 is a miniature inductive Proximity Sensor, also known as a "prox switch". It is a small, round device that detects the presence of metal objects without contact. The prox switch contains an inductor coil and an amplifier circuit, which generate a magnetic field around the device. When a metal object approaches the prox switch, the magnetic field is distorted, causing a change in the output of the amplifier circuit. This change is used to detect the presence of metal objects. The E2A-M08KS02-M1-B2 has a sensing distance of 8mm, a variety of models for different sensing ranges, a sensing frequency of 200-400 Hz, and a supply voltage of 10-30VDC.