The Canon EU-V1 Extension Unit mounts onto your C500 Mark II camera and provides increased connectivity, expanding the capabilities of the camera for remote operation as well as live video production. The expansion unit adds three ports: Genlock/Sync Out, Remote B (RS-422), and Ethernet. The Genlock/Sync Out port accepts a genlock signal that slaves your camera to the same time base as the other equipment receiving the genlock signal. Sync Out allows your camera to feed other live production equipment to sync to your camera.