Sweet little Emtac Mini-S3 Bluetooth GPS Receiver. This is a SiRFstarIII chipset.

It's pretty tiny - 67x48x22mm. Softtouch paint. Has a pretty tough little battery that I've never actually run all the way down and is replaceable. Worked just fine with the Treo 750.

Only used it 4 or 5 times for maybe a total of 1 hour of run time, so it's basically brand new. Has original box and CD.

Got it for $100 new. Selling for $65. PM if interested.