V4 series video multi-scene switcherconsist of a host V4 and console H1. One H1 console is able to control 9 units of V4 host.For LED screen project within 4K resolution, you only need one V4+H1. For large project over 4K, you can cascade multiple units of V4to realize big size mosaic display. Preset saving, preset loading, seamless switching...this is how V4 series fit your event!