Sources said that, Google's Android division has spent years in the development of the device. Apart from music, the device may also transmit other digital media and it is expected to be released later this year. This action, together with Google's acquisition of Motorola Mobility, indicates that Google is very serious about controlling both software and hardware at the same time, which is exactly the approach Apple takes. It is still unclear which retailers will sell Google Android entertainment system. The system allows people to download digital media such as music and transmit them to the speakers produced by Google or other connected devices at user's home. Currently, Google offers music for sale through Android Market online store. Sources said that, users can use smart phones or tablet computers to operate the new Google home entertainment system.