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Originally Posted by SDWeinman
Based on this post I checked the 640 on the Plantronic's website, and according to them it will not work with the Treo 650. I am assuming that it is just some of the features that won't work. I'm really torn between the 510 and 640. I currently have a motorola HS850 and I love everything about it except the low volume, which has made me not use it much, especially in the car.
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Clearly does.
The 640 is my fourth BT h/s and is far and away the most satisfactory. It is light, comfortable, and has outstanding sound quality. It was easy to sync and it is easy to charge. I have not stressed battery life yet but seems to be more than adequate, particularly with the variety of ways (120 AC, 12V DC, 5V DC via USB, and 1.5 V AAA battery) to charge it.