A nice touch is that the 2Pcs are small enough to fit in a pocket, so you can carry them around.
White Rogers Steveco 90-290Q RBM Type 84
You will find that its 70*20*18mm / 2.75*0.78*0.7" body fits well on DIN rail.
A nice touch is that the solid-state relay module has clear markings for easy wiring.
You will find that the model A110-30-11-84 is printed on the side, so it never fades.