Wear OS by Google

Previously known as Android Wear, Wear OS is a version of Google's Android operating system designed for smartwatches and other wearables. By pairing with smartphones running Android version 4.4 or newer, or iOS version 9.3 or newer with limited support from Google's pairing application, Wear OS integrates Google Assistant technology and mobile notifications into a smartwatch form factor. The platform supports Bluetooth, Wi-Fi, 3G and LTE connectivity, as well as a range of features and (third party) applications. Watch face styles include round, square and rectangular. Hardware manufacturing partners include Asus, Broadcom, Fossil, HTC, Intel, LG, MediaTek, Imagination Technologies, Motorola, New Balance, Qualcomm, Samsung, Huawei, Polar and TAG Heuer, Mobvoi.