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The +1 module from Red attaches to Epic and Scarlet brains and makes it possible to use a second Red display - either a second monitor or EVF. It also has a 4 pin Lemo 12V aux power port for powering accessories.
Note: this module isn't required to run a display via HDMI or SDI - it is for proprietary Red displays. Attaching this module consumes the HDMI port on the camera brain.