Power savings box power factor
Fraudulent claims capture inquisitive minds. This technique is only used by large industrial factories that pay for motor reactive power. It never works for consumers. But it may reduce fan motor click noises when switched off if you have any such electronic effects. It’s just a 1nF metal film cap costing &lt;&lt; $1 that one might be put across a motor switch to reduce EMI.
The “after” plot and all “claims” are fraudulent in practice.