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I can't read the Japanese product description for myself, so I'm not clear on how this thing works, if you need to input cycle length and other data for it to alert you to your ovulation days, but I'm not grasping what is so ridiculous about this, according to Rebecca Traister and the blogger. As someone who tracked her cycle carefully when trying to conceive, I appreciate handy technology assists to keep tabs on the data. I did it with paper and pen because it wasn't always convenient to turn on the computer to put in the day's entry. To be able to do it on a cute little phone (that also has, uh, phone functions) would have been very handy. And some women track their cycles for other reasons -- to try to avoid getting pregnant, to have knowledge of when to expect a period, and so on.
OK, I get that "cute, pretty, and little" can be viewed as condescending. But surely a tech solution to help you get more information about how your body is working can't be the antifeminist horror that Rebecca seems to think it is.