Google Now has been updated and comes packed with many features which, I think, are made to match the Android Lollipop OS. The user interface is a bit like Android Lollipop's interface. You can start a google search from anywhere while the display is on by saying "Ok Google". If the phone is charging, you can say "Ok Google" to start a search even if the display is off. If you're using Nexus 6, Nexus 9 or Samsung Note 4, you can simply start a google search by saying "Ok Google" even when the phone is not plugged in and the display is off.
To enable this voice search, go to 'Settings' (drag the screen from left to right and tap on 'Settings'), tap on 'Voice', then tap on '"Ok Google" Detection' and selection 'From any Screen'. Now you can say 'Ok Google' to start a google search when your display is on.
For Google Now Voice Commands, Click Here.
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