Icon Intro：

Click main menu to enter live preview

Icon Intro
	Add device
	Talk
	Unlock
	Mute
	Record
	Switch stream
	Snapshot

Open Video：

Click button, in existing device list, select video channel to play.

Switch Stream：

Step 1: Select a window playing video, click button to open stream switch panel.

Step 2: According to network condition adjust corresponding stream.

Icon Intro
	Fluency mode, Sub stream is used in this mode.
	HD mode, Main stream is used in this mode.