The Micro GPS Mail Logger from Brickhouse Security is a tiny GPS device that you place INSIDE a snail mailed envelope. You can then track your package remotely via Google Earth. The tracker is 1/4 inch and bendable, so it can be placed in any envelope. The gadget saves it’s GPS location throughout it’s journey onto a MicroSD card. When you receive the package, you hook the SD card into your computer and you can see detailed information about exactly where your package was. The logger tracks location, speed of travel, and altitude in a variety of user set increments. Of course, if your package gets lost in the mail, you’re totally screwed and out the nearly $700 this device costs!