Your MW65 headphones are optimized for Google Assistant out of the box.
On and Android device, you'll receive a notification to begin the setup process after you connect your MW65 to your Android device via Bluetooth.
On an iOS device, make sure your MW65 is connected via Bluetooth. Then download the Google Assistant app, open it, and follow the on-screen instructions.
For other devices you can enable hands free mode by holding ANC + Play/Pause simultaneously for at least five seconds, this will allow you to use your device's native voice assistant.
Once you are connected to your device's voice assistant, you can activate it by pressing and holding the Play/Pause button.