DROID MINI / DROID ULTRA / DROID MAXX by MOTOROLA - Touchless Control
Touchless Control is a separate application from Google Voice Search. Touchless Control waits for the launch phrase, 'OK Google Now' and then executes the command or sends the request to Google Voice Search.
From a home screen, select Apps (located at the bottom).
From the Apps tab, select Settings.
Select Touchless Control.
Select Touchless Control to enable or disable. Enabled when a check mark is present.
Training the device:
Select Train launch phrase.
Select Record or Re-record
Holding the phone away from your face, when prompted say OK Google Now. Currently, setting a personal trigger phrase is not available.
When prompted, select Continue Repeat steps 3 & 4 as required.
Select Launch when the display is off to enable or disable. Enabled when a check mark is present.
Select Call while locked to enable or disable. Enabled when a check mark is present.