HI-505SD is a standard Bluetooth GPS receiver with standard miniSD to SD adaptor.

Equipped with SiRF StarIII GPS chipsets and wireless Bluetooth module, the HI-505SD is a portable GPS receiver that drawn power from the SD card slot directly. You can simply plug HI-505SD into any devices equipped with the standard SD slot and start using the GPS navigation via bluetooth connection to the HI-505SD. For example, plug the HI-505SD GPS receiver to your Treo 750 SD slot, connect to the HI-505SD via bluetooth connection from Treo 750 or any other devices to receive location via the GPS receiver. There is an extra mini SD card slot if you still need more memory storage since it is occupying your SD slot. It can be also connected to the power source directly through the power adapter other than the SD slot.

Source via engadgetmobile