>The acoustic noise works in the brood, too. The juveniles (joung mites) are dying in the breeding cell within one day. 
 
I guess you could test this claim by uncapping brood and shaking out the contents of the cells to identify the dead nymph stages. Has that kind of research ever been done and is it even possible to do?

This link provides a little more information. Apparently, the device needs to remain in the colony on the top of brood frames for an extended period greater than 20 days or even longer.

https://www.indiegogo.com/projects/varroa-killer-sound#/

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