Mercedes-Benz MHI Bluetooth Interface Module Cradle Adapter Mercedes-Benz MHI Bluetooth Interface Module Cradle Adapter. For 2005 through 2009 Mercedes-Benz models equipped with the Mercedes-Benz MHI (Multi-Handset Interface) phone system. Enables hands free calling with Bluetooth wireless technology. Have the ability to continuously upgrade to newer phones in the future. Genuine OEM Mercedes-Benz part. Newest Version