Samsung's Gear 2 smart watch, which runs on the Tizen operating system rather than Google's Android software, can monitor the wearer's heart rate, a function used in increasingly popular health and fitness apps, or individual programmes.
The Samsung Gear Fit, also targeting the fitness sector, has a heart rate monitor, too, as does the Samsung Galaxy S5 itself, a first for a smartphone, Samsung said.
The Gear Fit has a curved touch-sensitive screen and its features include a pedometer, the South Korean company said.
The Galaxy S5, which will be available in April, has a slightly bigger screen than its predecessor, at 5.1 inches compared with 5 inches, improved camera technology and better protection against water and dust, Samsung said.
It also has a fingerprint scanner on the home button, it said, which can be used to protect data and provide security credentials in a swipe.
Analysts said the improvements in the fifth iteration of the Galaxy S, which has sold more than 200 million units in total, were more incremental than in previous devices, showing it was becoming harder to innovate at the top end.
Forrester Research analyst Thomas Husson said, "The Galaxy S5 has great features and will probably sell well due to massive marketing support.
"But is the total product experience it offers differentiated enough to continue the sales success story? Is it enough to bet on fitness and fingerprint sensors to beat Apple - rooting the experience in people's daily lives? I don't think so."
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