The CBK-CE01 is required to interface the camera adaptor (XDCA-55, CA-TX70, and CA-FB70) to the PMW-400, PMW-350 and PMW-320 XDCAM memory camcorders. The CBK-CE01 also necessary to add the 2x Digital Extender functionality to these camcorders, which will be available Winter 2010 as a No Charge software update, installable once the CBK-CE01 is onboard. Installation of the CBK-CE01 by an authorized Sony Service Center is required, also available at No Charge. Please contact your Sony representative for further details.