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Amazon offers an attractive deal with the budget-friendly BTV4 Bluetooth speaker, as long as you're comfortable sacrificing a bit of fidelity for price and portability.
The Aukey Portable Bluetooth Receiver comes with more features than many similar products and a clever means of remotely controlling playback from your phone, but it will involve running wires to a power outlet and an auxiliary input in a car.
The idea behind the MoGo Talk XD is clever, but we don't think the features fully justify its retail price.
The BlueAnt S4 delivers good call quality and, with its voice trigger system, increased vehicle safety. However, it excludes many popular handsets from its true hands-free claim by not including its own voice dialer.