This is a new unopened Pilz 542011 sensor kit containing 542051 safety switch with 542081 RFID target.

RFiD safety switch 2 safe SC outputs, 8-pin M12 male connector, support for SDD, IP67, 4 actuation directions, switching distance (actuator at square marking): 11 mm, Sao = 8 mm, Sar = 20 mm, PU = 1 piece coded switch with actuator, magnetic latching holding force 30 N.