Samsung Gear Family
From left to right: The Gear S, Gear Fit, and Gear 2.
SIM Card Slot
What really sets the Gear S apart is the built-in SIM card and standalone mobile data connection.
UV Detection
There's still a heartrate sensor built into the back of the Gear S, and Samsung also leverages an ambient light sensor to bring UV detection to your wrist.
Clasp
The Gear S will come with a swappable band with adjustable straps.
Send Texts
Instead of limited canned responses, the Gear S has a tiny, full-QWERTY keyboard with autocorrect so you can compose actual replies to texts and emails.
Tizen OS
Nearly everyone else is focusing on Google's Android Wear for smartwatch software, but Samsung sticks with its homegrown Tizen OS here.