14 ENGLISHPair and connect a Bluetooth device for the first time1 Press BSRC to turn on the unit.2 Search and select the name of your receiver (“KDC-BT640U”) on theBluetooth device.“PAIRING” “PASS XXXXXX” “Device name” “PRESS” “VOLUMEKNOB” appears on the display.• For some Bluetooth devices, you may need to enter the PersonalIdentification Number (PIN) code immediately after searching.3 Press the volume knob to start pairing.“PAIRING OK” appears when pairing is completed.Once pairing is completed, Bluetooth connection is establishedautomatically.• “BT1” and/or “BT2” indicator on the faceplate lights up.“ ” indicator lights up to show the strength of the battery and signal ofthe connected device.• This unit supports Secure Simple Pairing (SSP).• Up to five devices can be registered (paired) in total.• Once the pairing is completed, the Bluetooth device will remain registeredin the unit even if you reset the unit. To delete the paired device, see[DEVICE DELETE] on page 18.• A maximum of two Bluetooth phones and one Bluetooth audio device canbe connected at any time. To connect or disconnect the registered device,see [PHONE SELECT] or [AUDIO SELECT] in [BT MODE]. (Page 18)However, while in BT AUDIO source, you can connect to five Bluetoothaudio devices and switch between these five devices. (Page 19)• Some Bluetooth devices may not automatically connect to the unit afterpairing. Connect the device to the unit manually.• Refer to the instruction manual of the Bluetooth device for moreinformation.• Depending on the Bluetooth version, operating system and the firmwareversion of your mobile phone, Bluetooth features may not work with thisunit.• Be sure to turn on the Bluetooth function of the device to make thefollowing operations.• Signal conditions vary depending on the surroundings.Bluetooth — ConnectionSupported Bluetooth profiles– Hands-Free Profile (HFP)– Advanced Audio Distribution Profile (A2DP)– Audio/Video Remote Control Profile (AVRCP)– Serial Port Profile (SPP)– Phonebook Access Profile (PBAP)Supported Bluetooth codecs– Sub Band Codec (SBC)– Advanced Audio Coding (AAC)Connect the microphoneAdjust themicrophone angleSecure using cordclamps (not supplied)if necessary.Microphoneinput jackMicrophone(supplied)Rear panelBluetooth®