Apple unveils its version of the smartwatch.

FOX News Radio's Jessica Rosenthal reports:

(AP Photo/Eric Risberg)
(AP Photo/Eric Risberg)

Apple is billing its new watch as essentially being able to do a lot of what your iPhone can do. Apple CEO Tim Cook says it can send and receive messages.

(Cook) "You can also -- with a built in speaker and microphone -- you can receive calls on your watch. I have been wanting to do this since I was five years old."

It's heavy on health and fitness -- it tracks your heart beat. It even alerts you if you've been sitting too long.

(AP Photo/Eric Risberg)
(AP Photo/Eric Risberg)

Apple Pay is on it as well. And Cook says battery life is supposed to last 18 hours each day.

The sport version starts at $349. The main version at $549.

Jessica Rosenthal, FOX News Radio.