Uniden RDA-HDWKT is compatible with Uniden Radar Detectors models R8, R8W, R7, R4, R4W, R3, R1, DFR9, DFR9BLK, DFR8, DFR7, and DFR6. ADVANCED K/KA BAND FILTERING - The R4w has the best K/KA Band filtering resulting in fewer false alerts from blind-spot monitoring and collision avoidance systems.
eBay