The Dual Downward Gimbal Connector is required for mounting two cameras simultaneously to a Matrice 200 210 210 RTK Series drones. All Zenmuse X5S, X4S, XT and Z30 gimbals are supported. You can mount them to the Gimbal I and Gimbal Connector II as follows: Gimbal Connector I: Zenmuse X4S/X5S/Z30 Gimbal Connector II: Zenmuse XT/Z30 Please note that Gimbal Connector I and Gimbal Connector II cannot be mounted with two of the same Zenmuse gimbals.