Well the black box things are noisy. They produce some low level buzz (probably higher than mains frequency), you open the box and you get close, you definitely hear it. The worse thing is that it can be heard inside the bedroom when it's quiet in the night. Though very faint, it is definitely there.
I can feel the black boxes vibrating when touching them, and they are a tiny bit warm. What are they? Is there a fault? Do I need to pay Vector to get it fixed?
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