Steering wheel radio controls. Premium factory amplified systems will not fade as neither the aftermarket radio or the RP interface have the ability to control the amplifier's fader. Compatible with all radios that have an IR remote operating range of 38-40 kHz. Any radio that has an IR remote operating range outside of these parameters is not compatible. The SWI-X will not work with the RM-RK200 series, including, but not limited to, the RM-RK230, RM-RK240, RM-RK241 and RM-RK250. Known radios that are not supported: Sony: XAV-7W, CDX-MP80, CDX-MP70, CDX-M850MP, CDX-M3DI, CDX-M800, CDX-CA900X, MEX-5D1, MEX-1HD, CDX-M730, CDX-M770, CDX-M7815X, CDX-M620, CDX-M670, CDX-CA850X, CDX-M9905X, CDX-CA860X.