FULL DUPLEX DSP -Full Duplex Digital Signal Processing of audio by every Bluetooth ® system means you are assured the very best sound quality throughout every phone call or every streamed song. MULTI-PAIRING -Utilizing the internal memory in every Bluetooth ® module allows for the memorization of up to 5 different cellular phones! Extra phones can be added in just a few short steps, if needed. RAPID CALL TRANSFER -Phone calls already in progress are transferred between the Bluetooth® module and your cell phone seamlessly when your vehicle's ignition is turned on or off. VOLUME CONTROL -With the single-button volume control built into every Bluetooth ® control switch, the audio playing over your vehicle's speakers is centralized, easy to find and easy to use. INCOMING CALL REJECTION -Got a call coming in that you don't want to take? Built into our control switches and modules is the functionality to reject a call, transferring it safely to your voicemail. UPGRADEABLE SOFTWARE -Software upgradeability within the Bluetooth ® module means that as the Bluetooth® standard grows within the cellular phone industry, you're Con-Verse system will be able to keep pace.