GDO
Production information
Manufacturer	Tau'ri
Technical specifications
Function	Identifying device
Made of	Steel/ PVC
Power source	silver–zinc batteries
Usage
Affiliation	Tau'ri Tok'ra Bra'tac

[Source]

The G.D.O. (aka Garage Door Opener) is a Tau'ri device that transmits a signal to the S.G.C. computer, identifying the SG unit and opening the iris covering the Earth Stargate.

A G.D.O. and iris code (a sequence of numbers that must be manually entered into the G.D.O.) is assigned to every member of every SG team. The codes can be altered if one of the devices is compromised. If a team is captured or too long overdue, their G.D.O.s are locked out of the system. (SG1: "Children of the Gods") G.D.O.s have also been given to various allies, such as Bra'tac and the Tok'ra. (SG1: "Family", "Serpent's Song")

The Atlantis expedition also possesses G.D.O.s, but of a different design. They are assigned to individuals instead of teams, and are coded to a specific user. (ATL: "Rising", "Home", "The Storm")

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