1 Maximum Number of Screen Mirroring Connections A TV can only mirror the screen of one device at a time.   If the TV is already in screen mirroring mode and another device attempts to connect, a message will appear at the bottom of the screen reminding the user to disconnect the current device before connecting a new one.

2 App Exit Method During screen mirroring, users can press the back button to disconnect and return to the HaiCast home screen.   To prevent accidental exits from the app while on the HaiCast home screen, you must press the back button twice to fully exit the application, as shown in the figure below.

3.This feature is only on Android devices and Windows 10 OS and above.please ensure that your mobile device supports screen mirroning