Which Karcher window vac to BUY?

What's the difference between the karcher window vacs WV1 WV2 and WV5, which karcher window vac to buy, and how to use the karcher window vac.

USA Links
Karcher WV50 https://amzn.to/2JDMmTF
Karcher WV1 https://amzn.to/3khIODu
UK Links
Karcher WV1 https://amzn.to/3lb9EOx
Karcher WV2 Plus https://amzn.to/2U605Vp
Karcher WV2 Plus N https://amzn.to/3n5sWWa
Karcher WV5 Black https://amzn.to/3p8NsqW
Karcher WV5 Plus N https://amzn.to/3paZtMo
Karcher WV6 Plus N https://amzn.to/3leJnz1
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Видео Which Karcher window vac to BUY? канала Rich Man Poor Tech