I prefer the with brown switch because it doesn't reflect light or distract on busy panels.
ZWave Long Range Low Voltage XS Relay ZEN58 800LR Hub Required
You will find that the black color resists showing dust and smudges better than lighter options over time.
With the black color, the relay blends in well, which can make the whole panel look more cohesive.
A nice touch is the black housing, which gives the relay a simple, classic look on the panel.
The blue housing is easy to see, so you can quickly find the right relay during maintenance.
The KanSmart name is on the unit, and that small detail matters when you want consistency.
A nice touch is the matte black look, which reduces glare when you view the board from an angle.
The black color is a nice touch, helping the unit stay visually subtle next to other components.
You will find that the black color makes it easier to match with other black connectors and terminals.
Because it is black, the relay looks uniform when you group several units together in a row.