This new interface allows you to access, edit, and control settings for many of the most commonly lost vehicle personalization options after changing out the OEM radio. This could be settings for locks, security, engine off options, lights, a chime or other audio options that aren't available to control on the new head unit. The Axxess Bluetooth® Interface (AX-CUSTOM-BT) will let you manage these settings from the palm of your hand using the free Bluetooth® smartphone app. It is designed as an add-on product for aftermarket radio upgrades when using a vehicle specific Axxess interface. The vehicle personalization options are specific to each application, and dependent on what was available in the factory radio prior to removal.