"Our expectation is that users will be using our services and viewing our ads on an increasingly wide diversity of devices in the future," the company officials were quoted as saying.

Google's concept watch has a touchscreen and also voice control built in. The firm will build a special app store for wearable software that can show ads.

According to Google, it is working with LG, Samsung, Motorola and others to include the software in their watches. Google has also bought Nest Labs, a startup known for smart thermostats and smoke detectors.