ViewSonic Lamp Free Smart Theater can control projector via voice commands, such as volume, power and source.
You are required to bind vRemote Android or iOS app to your vRemote accounts when they use ViewSonic Lamp Free Smart Theater at the first time. Meanwhile the vRemote account must have been added at least one smart device.
You need to say "Hey Google, talk to ViewSonic" and wait for Google's feedback"Hi, welcome to use Viewsonic", then you can use below commands to control the projector.
Set volume to [0-50]
Change input to [HDMI1~4/USB/Computer]