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Batteries can be replaced but it's a specialty and I will leave that to the new owner. Also missing the wireless insert for the computer but most people don't use that anymore anyway as they sync with their phones.
eBay
It was sitting in a box and missed the opportunity to be upgraded to the latest firmware, so now it will remain on the 6.46 version partially supported by the Fitbit app Sync data to the Fitbit phone app.
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New in box.
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eBay
this is open box Track your all-day activity, 24/7 heart rate, & sleep stages, all with a 4+ day battery life (varies with use and other factors) and a slim, comfortable design with a lightweight, anodized aluminum watch body. Syncs with Mac OS X 10.6 and up, iPhone 4S and later, iPad 3 gen. and later, Android 5.0 and later and Windows 10 devices. Syncing range: Up to 6.1 m Use 15+ exercise modes like Run or Swim (Fitbit Versa is water-resistant to 50 meters) to record workouts and connect to smartphone GPS for more precise real-time pace & distance
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eBay