Thank you for viewing my items. I was using this in my car audio system. I used an Android device (LDAC compatible) via Bluetooth and aimed for high-quality sound at a reasonable price with this setup to maximize the high-resolution lossless audio from Apple Music. It significantly improved the sound quality for convenient Bluetooth playback, resulting in a decent level of sound quality. As someone who loves music, I've decided to switch back to wired connections, so I'm putting this up for sale. 【UGREEN High-End Set】 ・BT509 High-Performance Bluetooth Receiver (LDAC compatible) ・RCA cable (HiFi compatible, high-performance shielded) This allows playback at the highest Bluetooth standard of "24bit 96KHz"! Although iPhones don't support LDAC, using AAC as the maximum codec, you can still enjoy the best possible sound quality from your iPhone. It's practically unused, having been played only a couple of times, and there are no issues. Before changing your speakers, why not improve your car audio sound quality with this affordable and easy-to-set-up configuration? If you want to enjoy music by utilizing the high-resolution sound source via Bluetooth, this is for you! Are those of you using high-performance speakers from brands like KENWOOD and Carrozzeria making the most of your speaker's capabilities?