Buy nonda ZUS Universal HD Car Audio Adapter, All Compatible Music Adapter, Wireless in-Car Bluetooth FM Transmitter Radio Adapter, True Wireless Stereo, Find helpful customer reviews and review ratings for nonda ZUS Universal HD Car Audio Adapter, All Compatible Music Adapter, Wireless in-Car Bluetooth FMView the User Manual for the No NDA model ZUMABKSAV ZUS Universal HD Car Audio Adapter 2AFZB-ZUMABKSAV. View the PDF file for free. No joining required. Switch your car's FM radio to an 91MHz frequency. Then, adjust the radio frequency state the frequency fixed at 91 MHz on the adapter to match.