https://arstechnica.com/gadgets/2022/01/garmins-new-fenix-7-maximizes-solar-power-and-finally-adds-a-touchscreen/

Garmin has released two new high-end smartwatches, the Fenix 7 and Epix, less than two weeks after launching the Venus 2 Plus and Vivomove Sport at CES. The Fenix 7 is the latest iteration of the company's robust, multi-sport flagship, while the Epix picks up the torch of a similarly high-end watch that hasn't seen an update since its release in 2015. Both are aimed at the outdoor adventurer who treks far and wide.

That's why all three sizes (42 mm, 47 mm, and 51 mm) of the Fenix 7 can be equipped with solar charging. The smallest and mid-sized variants (Fenix 7s and Fenix 7) make this feature a $100 premium add-on, while the largest (Fenix 7X) has the feature standard. That tacks on an extra nine days of battery (on top of 19 days without solar charging) in smartwatch mode, according to Garmin's estimates.