The solar cell only extends the battery life, you still need to charge it (about once a month). There are several other Fenix 6 models too.
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Garmin® announces the fēnix® 6 series
Garmin Fenix 6 Pro Solar Edition GPS smartwatch review
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Garmin fēnix 6 Pro Solar The Last Smartwatch You'll Buy
Garmin fenix 6X Pro Solar, Premium Multisport GPS Watch with Solar Charging Capabilities, Features Mapping, Music, Grade-Adjusted Pace Guidance and Pulse Ox Sensors, Dark Gray with Black Band : Electronics
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fēnix® 6 Pro Solar Titanium
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