Is 26-387 a good after-market vent lock

A quick learner from San Diego says:
I'm looking for an after-market vent lock for my vinyl double-hung windows. I don't know the brand. The house was a flip, so likely not high end. Is this the best/most secure option?Or would you recommend something else?

Face Mount Single Action Vent Lock Kit
Product Code: 26-387

Also, if I order one, is that one pair or do I need to enter two as the quantity for each window? Thanks.
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Tom from SWISCO responded:
If your windows do not currently have vent locks, then the 26-387 is the best option we have at this time, yes. See the video below to see how they work. This is a kit that comes with everything shown, including shims.
Hardware included with 26-387
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