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My Seido G2100S finally arrived this week. The G2100 is like the G2500 in that it has a GPS serial input, but it has no speaker phone for the Treo. It charges the phone and the GPS receiver. The latest update from TomTom fixes the T650, and the serial TomTom GPS receiver works fine with the G2100. Its nice to be able to use the T650 as a GPS again in the car.