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
text Steve, how are you?
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!