Flex 2 is Fitbit's first 'swimproof' fitness tracker - The Verge
Compatible With Fitbit Flex 2 Bands,replacement For Flex 2 Sport Accessories Bracelet Band Strap Soft Silicone W/fastener Clasp For Flex 2 Watch, Adju | Fruugo UK
Fitbit Flex 2, Charge 2 add swim tracking, new ways to use heart rate | MobiHealthNews