The Nokia Advanced Car Kit is Nokia's first car kit to combine two connection methods - Bluetooth and conventional wired connection via mobile holders supporting phones using Nokia's Pop-Port connector. Please note a seperate cradle with a Pop-Port maybe required. This gives users a choice between using their mobile phone in the mobile holder or leaving the phone in a briefcase or handbag and taking advantage of wireless Bluetooth technology. With either option the phone can be operated using a remote control button, which offers functions including answering or ending calls and adjusting volume. Necessary components for connecting a mobile phone to the Nokia Advanced Car Kit via Bluetooth wireless technology and cable are included in the sales package - except for the handsfree mobile holder, which can be purchased separately for the particular phone model used. Nokia recommends having the system installed by a qualified professional. This kit includes: Handsfree Unit HF-5 Remote Control CU-7 External HF Speaker HFS-12 Microphone MP-8 Data Cable CA-27 Mounting Plate MK-2 Power Cable PCU-4 User / installation guide