Samsung Electronics has unveiled its Galaxy S5 at the world's largest mobile show.
 
The electronics giant revealed the latest model of its Galaxy smartphone series and three wearable devices at the Mobile World Congress in Barcelona, Spain.
 
The Galaxy S5 has a screen that is more than five inches big, or the largest among the Galaxy smartphones. It is also the world's first smartphone that has a heartbeat sensor.
 
Samsung Electronics said when it made the Galaxy S5, it focused on enhancing functions people consider the most important in daily life, such as the battery life, camera and the Internet.