I believe the Gear Sport has that ability, but the S3 technically isn't "waterproof" so I don't think Samsung wants to encourage people swimming with it. I do both and also spend a lot of time in my hot tub - it's no problem for the S3 :) I have showered with mine quite a few times with no issue. Just rinse all the soap off.
It is mainly used for fitness monitoring devices such as heart rate monitors and cadence sensors to connect to other devices (e.g., sports watches, smartphones, and cycling computers). NFC (near-field communication) allows a device to perform simple wireless transactions, such as mobile payments.
Both Gear S3 models are IP68 dust- and water-resistant, meaning it can handle all reasonable amounts of contact with water; the Frontier is also MIL-STD 810G rated, meaning it can handle extra
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Skinomi Full Body Skin Protector (Gear S3 Frontier) $13 at Amazon Skinomi might only offer one screen protector in this kit, but it also comes with a clear protective skin to protect other exposed
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gear s3 frontier waterproof test