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Garmin announced today it has partnered with fertility/birth control app Natural Cycles to share temperature data from the Garmin app to Natural Cycles. To use this feature, you’ll need a supported Garmin watch. Currently, these include the Fenix 8, Forerunner 570 and 970, Venu 3 and 3S, Venu 4, and Venu X1. (The full list of compatible devices is here.)
Garmin Venu 4, 41mm $559.99 at Amazon Get Deal 
Get Deal $559.99 at Amazon
Those are all pricey watches—the Venu 3S is the cheapest among them, and will still run you $350—so I don’t expect
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