Compatibility: This mount holder is compatible with Cardo Packtalk and Cardo PRO helmet communication systems. It is designed as a replacement part for the second-generation Cardo mounting system and is not compatible with first-generation Cardo mounts. This item is intended for use as an additional or replacement mount when installing the Cardo Packtalk or Cardo PRO system on a second helmet. It provides the same mounting functionality as the second-generation mount included with the device. Before purchasing, please verify that your Cardo device model is Packtalk or PRO and that you require a second-generation mount.