the bellabeat leafWe know personal trackers are quite the rage right now, but this is wild. Of course it does offer something different: tracking a woman’s ovulation period. But there’s nothing high tech about that, it just tracks the number of days.

The new device is called the “Bellabeat Leaf.” It looks like a silver leaf you pin to your outfit. They sold out the first 10,000 units in 48 hours. The second shipment was 94 percent sold when we went to press. A special edition sold in one hour.

All of which proves you can move a fitness tracker by adding some special appeal. It doesn’t have to be much, it just has to be useful in some way. The “Leaf” monitors sleep, stress and all the usual stuff, like calories burned and distance walked, and offers suggestions for better health. It’s $119 from bellabeat.com and apparently has hit a nerve.

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