A nice touch is how the RS-1M-SH lines up with the datasheet specs you already know.
SIGMA – C9179-X-6749 – Mini Open Frame 12V Form A, Normally Open Contacts, New
The NVX name is right there on the unit, and that subtle detail actually adds a bit of confidence.
A nice touch is the NVX logo, which sits neatly on the casing and looks like it will last.
You will find that the NVX mark is there when you need it, which helps keep your wiring labeled correctly.