Bluetooth car kits are best for people with older cars who need bluetooth connectivity to stream music from their smartphone but don't want tio splurge on a new car stereo. They have three bluetooth car kit options: A bluetooth receiver with an auxiliary-audio output, a BT receiver with a built-in FM transmitter, or a Bluetooth speakerphone.

Whatever kit you choose, you will need to use your car’s accessory-power outlet, or get something that you will have to recharged regularly.

The best bluetooth kit for aux-in: Anker SoundSync Drive (best audio quality, track-control buttons on the main unit)
The second best bluetooth kit for aux-in: iClever Himbox HB01 ( abit expensive, lets you pair two phones and comes with a charger)
Best bluetooth FM transmitter: GoGroove FlexSmart X2 (best for music streaming)
Best bluetooth speakerphone: Motorola Roadster 2 (includes a built-in motion sensor, built-in FM transmitter)