The Blackmagic ATEM Mini HDMI Live Stream Switcher is a compact device that can handle up to four HDMI sources and output to a projector or monitor via HDMI, as well as to a computer for live streaming via USB. It also includes a 2 channel digital mixer for sound control, making it a versatile tool for live streaming and video production. And you’re right, its compact size makes it very convenient to use and transport.