The Android Wear watch has a feature called: `OK Google... your_command`. To use it download **Google Now** on your android phone. You can talk to your watch anytime you want and use commands like: 

 - `set an alarm`
 - `set a timer for 10 minutes`
 - `call Steve`
 - `text Steve, how are you?`
 - `open <your_app>` //example: `open Google Maps`
 - `take a note, buy cat food at the supermarket.`
 - `remind me over 10 minutes, buy cat food at the supermarket.`
 - `hello` //use this command to see a list of available commands.

Hope my answer helps you!