|Tau'ri homing device|
Unknown (possibly) battery unit
Tau'ri homing device is a tracking device designed by the Tau'ri.
Tau'ris homing devices is an electronic device that allows the users to find and give direction to the distance to the target. It is possibly powered by a battery unit.
In 1997, SG-1 used one when they traveled to Gaia in hopes of locating and capturing the Fenri so that they could learn about the cloaking abilities. It was used in the Field Remote Expeditionary Device but with little success. However, when the team arrived at the Stargate, the FRED was still there although the homing device had disappeared.(SG1: "The Nox")