We partnered with Wired to bring you a peek inside an FBI car-tracking device. The device is similar to the one Yasir Afifi found underneath his car. If you're curious where this one came from, Wired has posted a writeup about Kathy Thomas, the woman who found this tracker under her car. They've also posted a video of Kyle doing the teardown.

The device comprises a GPS unit for receiving the car's position, an RF transmitter for relaying your location to the interested authority (i.e., the FBI), and a set of sweet D-cell batteries that power the whole enchilada. But we didn't stop there, of course. Read on to find out exactly what components make this secretive device tick.

Disclaimer: We love the FBI. We've worked with them on several occasions to fight crime and locate criminals. We've helped them with instructions on gaining entry into certain devices. We have nothing against them, and we hope they don't come after us for publishing this teardown.