When you use a projector to wireless display a PPT file or a video, You may be confused about Miracast/Airplay/WiDi/Chromecast/DLNA/Screen mirror and Happycast App and so on.

Let's know more clear about these technologies and Apps.

• Miracast  https://en.wikipedia.org/wiki/Miracast
• Airplay  https://en.wikipedia.org/wiki/AirPlay
• WiDi is Wireless display   https://en.wikipedia.org/wiki/WiDi
• Chromecast  https://en.wikipedia.org/wiki/Chromecast
• DLNA  https://en.wikipedia.org/wiki/Digital_Living_Network_Alliance
• Screen-mirror  https://www.lifewire.com/what-is-screen-mirroring-4154335
• Happycast App

When you use the Happycast app, you should download and install it on your cellphone/Laptop and the projector.
For Android Device:
Just open this link with your android device and download and install this app:
http://ftp.hpplay.com.cn/update/happycast_mobile.apk
For Windows pc:
Here is the link for download this app:
http://ftp.hpplay.com.cn/update/happycast.exe