To use it, all you will need is your Android Wear smartwatch, which will help you locate your missing smartphone. Our guess is that you might need to be synced to your device, but if WiFi support does come in the next Android Wear update, then maybe you won’t need to be linked up.
As stated in the blog post from the Android team, “To use this new feature, just say ‘Ok, Google. Start. Find my phone,’ or select the ‘Find my phone’ option in the Start menu. Your phone will ring at full volume, and you’ll be that much closer to, well, finding your phone.”
Additionally, it is automatically rolling out all Android Wear users, meaning you don’t need to do anything to enable it.