We must start from the beginning. This product is used to control internet content on their TV with the simplicity of the smartphone. In short, we look on his TV youtube looking with his phone, it's simple and effective. The wireless configuration takes only 10 minutes and nothing complicated. After installing the key, just install the extensions Chromecast on his phone so we can begin to "caster". The advantage of this system is that the diffusion of videos is not dependent on the configuration of the phone. Clearly, anyone connected to the home Wi-Fi network can broadcast videos of his choice from youtube. One can also connect to multiple smartphones at the same time. There are many free and paid applications that can stream content. Quality videos, the key fits the quality depending on the rate offered is efficient and enables transmission without interruption. However I would have preferred to have the choice between an auto setting (effective) and manual to force high definition videos. so make sure to have a good wifi and especially a good speed network available. This key is a good buy which interest or frustration greatly depends on the quality of the connection. But why Google can not do anything.