A nice touch is the subtle glow, which feels friendly during late-night repairs.
Bender UG 140 P Insulation Relay Earth Fault Monitor A-ISOMETER 24V DC B916382
When you install it, the brand carmorecar2017 is right there on the label, which looks reassuring.
You will find that the Formiden brand is on the side, so it does not obstruct wiring.
If you check the model, you will find that it is DEK-OE- 12DC/ 48DC/100.