What's that light for?

I have PIR motion-activated lights in my basement. This morning, I wanted to check on the installation of my DCMs as one of them is saying I’m spending negative $35 / year on my dishwasher.

In any event, I must have stood there for a long time (away from the PIR sensor) and then the lights went off …

To my surprise, the Orange box i.e., Sense, lit up (near the connectors) … I always thought it was an opaque box with only circuitry and no light, but now, in the dark, it radiates some reddish light (of course, housing color).

My question then, what’s the light for? Especially that it’s only visible in darkness?

Is it supposed to blink for various messages/info ?

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