The A30 4K mobile phone screen projector is a small "receiver" device that can be inserted into the HDMI interface on the back of the TV to wirelessly transfer streaming media content from devices such as computers, mobile phones or tablets to the TV. The A30 4K will likely be mainly used in combination with applications with a "DLNA" button and supports operating systems: Android, iOS, macOS, Windows. It's functions stronger than Chromecast.