Designed to specifically work with Alpine’s next generation display audio head units, the RUE-BK01A connects wirelessly and installs directly to the iLX-511A and iLX-F509A.Complimenting the aesthetic design cues of Alpine’s Halo concept the control knob mounts directly to the Halo display.The Alpine Rotary Knob allows for easy and enjoyable adjustment of audio volume as well as the ability to toggle between your vehicle camera’s.Please note: This product contains a coin/button battery, please download and refer to the Owners Manual for warnings and instructions.