LR12BF02DNC is a proximity sensor made by Laobao. It is a two-wire, DC, negatively-switched, flush-mount, 12 mm diameter, straight-barrel style sensor. It is designed to detect metal objects, such as screws, bolts, and nuts that are within 8mm–35mm of the sensing face. It has an operating voltage of 10.5–24V DC and a response time of 1.5ms. This sensor is ideal for applications such as machine automation and security systems.