This product was announced back in 2011 at a Bayer "Bee Care" event
http://www.beecare.eu

But the varroa-gate miticide is Coumaphos (Bayer Check-Mite).   Not sure
that this is a good idea given the widespread resistance to Coumaphos that
appeared back when it was more widely used:
www.apidologie.org/articles/apido/pdf/2004/01/M4104.pdf

And what kind of dose is required to get a reliable contact kill on varroa
so effective that they die before they can mate?

It is very true that effective treatment of varroa is often frustrated by
the fall robbing of collapsing, varroa-infested colonies kept by nearby
"treatment free" beekeepers and/or beekeepers oblivious to the central
importance of varroa monitoring

I've been advocating for the universal distribution of entrance reducers,
with the concept "sold" (to avoid acrimony) as a way to allow all colonies
to defend themselves, and avoid robbing.  I call the talk "You Are Your
Brother's Beekeeper".

If you think I am over-reacting, the unexcitable Eric Mussen wrote an
article in his Nov/Dec 2011 newsletter entitled "Nuisance Beekeeping",
saying:

"Laissez-faire beekeeping also can lead to serious problems for nearby
beekeepers."

"As a laissez-faire beekeeper, is it appropriate to allow colony dwindling
to continue to completion? Robbing bees from stronger colonies will become
infested with mites when they interact with bees in the dying colony. As the
heavily infested colony dies off, hundreds of adult bees carrying large
numbers of mites will fly from the hive in search of a better place to
live..."
http://entomology.ucdavis.edu/files/147879.pdf

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