Google has kicked off an effort to bring Android to wearable devices, reminding everyone that the OS is not just for tablets and smartphones.

Google senior vice president of Android, Chrome and Apps Sundar Pichai announced Android Wear, which the company characterised as a "a project that extends Android to wearables," in a blog post yesterday.

Google said it will initially focus on getting manufacturers to use Android Wear in smartwatches, but will extend those efforts to a wide range of body-fitting devices. Smartwatches powered by Android Wear will come later this year, Google said. Google is working with companies including Fossil, Asus, LG, HTC, Motorola, Samsung, Intel, Mediatek and Qualcomm on smartwatches.

One of the first devices to based on Android Wear is Moto 360, Motorola's first smartwatch. Announced yesterday, the smartwatch will become available in "summer" this year, the company said. The smartwatch is designed to offer relevant information at the right times, providing email and call notifications and also showing social media posts.

The smartwatch can also take voice commands to do tasks, according to Lior Ron, Motorola's corporate vice president of product management.

For example, users can voice commands such as "OK Google, tell me sport scores." Users can also use the device for "scheduling an appointment, sending a text, setting an alarm or taking a note," Motorola said.

The Moto 360 embodies many of Google's goals for Android Wear, including making apps for smaller screens and enabling new forms of voice interaction. Google said that voice interaction in Android could also be used to call a taxi, send a text message or set an alarm. The idea is to get "straight answers to spoken questions," Google said. Similar technology is already available on some Android smartphones.

Another goal is to get Android Wear devices to interact with larger devices like smartphones, which are faster, have more storage, and tap into 3G or 4G cellular connectivity for cloud services. For example, saying "OK Google" to a smartwatch could provide access to a music playlist on a phone. Such a feature is already available on Samsung's original Galaxy Gear smartwatch (top image), which ran on Android. That smartwatch has since been succeeded by the Gear 2, which is based on Tizen, a Linux-based mobile OS backed by Samsung and Intel.

"There's a lot of possibilities here so we're eager to see what developers build," Google said.

Google is also targeting Android Wear at health wearables like fitness bands and trackers, which received a lot of attention at this year's International CES.

Google is providing access to the Android Wear Developer Preview, which provides tools, APIs and an emulator that allows developers to test apps on the Android Wear platform. Android for wearables is based on Android's rich notification system.