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Motorola Bluetooth Wireless Portable Speaker HF800
Extract
"The volume is quite loud thanks to its one-watt speaker which incorporates sophisticated duplex, echo and noise cancellation technology. The voice quality is excellent at overcoming road noise and windy conditions. Because of the small size, you can place the speaker anywhere in the car, such as on your visor using the included pouch with clip. Even when we put it inside of a storage shelf just above the cigarette lighter in a BMW 325i in our test, we could hear loud and clear. You can adjust the volume using the jog dial. In addition to the loud speaker, the HF800 has an extra headset jack. This proves to be very useful if your conversation didn't end when you arrived at your destination; you can simple carry the speaker with you and plug in a headset so that you don't bother other people and keep the conversation private"

Conclusion
Pro: A portable wireless speaker that doesn't require any installation. Better yet, it's not even tied to your car. You can carry it anywhere you go and use it as speaker + mic or plug in a headset. It's got an attractive design in a small size and is light weight. Pairs easily and has reliable connections with paired devices. Supports Hands-Free and Headset profiles. Had great voice quality and high volume for use on the road. Good battery life and can be charge with both in-car and wall A/C charging options.