KCE-237B Radio Bluetooth Aux Cable Adapter Radio Extend Bluetooth Wireless Audio Device for Alpine KCE237B Features : - The bluetooth module is made for Alpine KCE-237B - It is bluetooth 5.0 version, not need password when connecting. - Just plug the blue connector into the socket back of your radio - You can just Insert this item to the back radio then Connect the red wire to 12Vand, the black wire to 12V-. - Match your phone or pad to bluetooth module.and Choose Aux from your radio, then you can use your phone to play music through car speakers. - You can hear music from your phone/pad/mp3(They should have blueooth function). Cable length : 23cm Fit model : for Alpine 2009 up CD player , like CDE101E 102E 105E 117E 123E 305S 520E 800C Package includes : 1PCS Bluetooth Auxcable Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.