This hand free kits is better than Bluetooth . You can get power from car light and play song and call from car stereo.

Features:

Connects your phone to your car stereo easily over FM radio waves. Handsfree talk function offer you more safety during driving.

• Hi-Fi stereo broadcasting for incoming call and music.
• Mutes the music and switches to talk mode during calls.
• Hands free talk via high quality built-in stereo microphone and the car stereo.
• Powered by the car's power source.

Specifications:

• Transmission range: 87.9MHz~107.9MHz (interval 0.1MHz)
• Dimensions: D35 x W40 x H11 (mm)
• Accessory: car adapter - Mini USB 5pin, input 12-24V 150mA, output 5V 150mA

Compatible with Competiable Model

• For all "POP-PORT" Interface Nokia mobile Phone:
• 3100, 3120, 3200, 3220, 3230, 3250, 3300.
• 5100, 5140, 5140i. 5500 sport
• 6020, 6021, 6100, 6101, 6111, 6170. 6136 6125 6070
• 6220, 6230, 6230i, 6260, 6270, 6280. 6230i 6275i
• 6610, 6610i, 6630, 6650, 6670, 6680, 6681, 6800.
• 6810, 6820, 6822.
• 7200, 7210, 7250, 7250i, 7260, 7270.7370/7360
• 7600, 7700, 7710. 7370 7630 7270
• 9300, 9500. 9300I
• E50 E60, E61, E70. E71
• N70, N72 n73 n71 n80 N90, N91,n93/N93i N92

How to use:

• Connect the FM transmitter to your mobile / PDA, connect the FM transmitter to the mini USB car adapter, plug the adapter into the car's cigarette lighter.
• Tune into an unused (blank) frequency channel of the receiver and adjust the volume of the receiver.
• Press UP or DOWN button to adjust the frequency of the FM Transmitter according to the receiver.
• Play the music of your mobile through the car stereo.
• You can also use the handsfree function when you make a call. *For optimal voice clarity, distance of 30 to 60cm between the speaker's mouth and the microphone is advised. If distortion or significant noise happens, please tune down the volumn of mobile phone and tune up the radio.

I also have car holder for sale, I can combine post.