Enable most useful and most popular feature of Android device Ok Google on any Android device. Just follow this simple tutorial to make this happen.
Below is the quick tutorial to enable the Ok Google feature on your phone.
Go to the Settings Menu > Smart Assistance > Voice Control
You will find Voice wakeup option in this screen, that option will allows you to setup the hotword to wake the device and launch basic commands with your voice.
Below is the Full Tutorial Video, it will help you to use Ok Google feature on your phone.
Checkout the second way to perform this action at Here.