NJK-5002A is PNP, NO, when the sensor meets the magnet, the output is high electricity level positive side;
NJK-5002B is PNP, NC, if the sensor is not close to the magnet, the output is high electricity level positive side;
NJK-5002C, NPN, NO, when the sensor meets the magnet, the output is low electricity level negative side;
NJK-5002D,NPN, NC, if the sensor is not close to the magnet, the output is low electricity level negative side;