Yeah, I've seen that RCA chime hum box article when researching my slight hum on my downstairs chime after installing RCA doorbell. It seems plausible as Ring calls their hum fix kit a "Pro Power" and August labels theirs "Power board" so Hikvision is marketing theirs as "Power Booster". The only thing that that didn't make sense was why does end user have to click on the checkbox to enable "Power Booster". All the other official hum fix kits doesn't require enabling anything in software.Possibly stumbled across additional power booster related info on the RCA site...
https://voxxintl.zendesk.com/hc/en-us/article_attachments/360000906273/PDF_Chime_hum_Fix_.pdf
The wiring diagram "appears" to show it connecting to the same terminal as the previous pdf file, cant say for sure though
http://www.hikvision.com/uploadfile/image/511330_NA-KB6013-WIP Data Sheet.PDF
If this new discovery is indeed related to the mysterious power booster.... it seem its just a box to fix the Hum some users hear from their mechanical doorbell. Too bad I can't read the barcode/label clearly in the new PDF file to get a partnumber