Make calls and listen to messages with speaker support. Screening calls from your wrist is a nice convenience that comes with Android Wear. Thanks to speaker support, you can now make and take calls over Bluetooth. And you can listen to audio/video messages with apps like Glide. All you need is a watch with a speaker, which today includes the Huawei Watch and the ASUS ZenWatch 2 (49mm).
Official Android Blog: Android Wear: Designed for your wrist
Official Android Blog: Android Wear: Designed for your wrist