Recently Google launched “Ok Google” Command and with its success now “Ok Google” extension for Chrome browser was launched. With this extension chrome users can use the hot word “Ok Google” to initiate hands-free searches inside the browser.
You can get the extensions by searching “Google Voice Search Hotword(Beta)” in Chrome web store.
Download the “OK Google” Extension for Chrome Browser now directly
Once Installed follow the how to get started steps provided by Google.
How to get started
1) Download the extension.
2) Click “agree” to give your permission to use your microphone.
3) Visit Google.com on Chrome and give it a try. Just say “Ok Google” and then ask your question.
Keep in mind that its a Beta Version.
Size : 4.58 MB
More Details at Google Blog