The Amazing SIRIUS-XM Fm Direct Adapter Directly connects FM output signal from plug & play unit's internal FM modulator to head-unit FM antenna connection Internal relay switches between SiriusXM when PNP is powered on & AM/FM pass-through when PNP is powered off Compatible with Sirius dock & play radios, XM dock & play & portable radios with a PowerConnect vehicle kit, XM SkyDock, XM Snap, Edge vehicle kit & Link vehicle kit Kit includes: 2ft FM antenna cable 19.33ft 3.5mm cable