Stargate activation device

Device of unknown origin, perhaps Ancient, of which a wearer can wave their hand over, instantaneously locking the Stargate into a desired location. Evidence that this is Ancient technology is derived from the fact that allies of the Ancients, such as the Nox and Asgard, possess similar versions of the device.

A future device in possession by the S.G.C. (pictured) was gold with a green crystal. The Asgard version appears very much like an Asgard data stone.

KEY EPISODES

Children of the Gods - Though they could have accessed the dialing computer, it is believed Apophis is in possession of a gate activation device, which he uses to allow he and his soldiers to escape Earth with an Air Force hostage.
Enigma - Though this is not confirmed, Lya of the Nox may use a concealed Stargate activation device to lock on to the Nox Homeworld and transport Tollan refugees.
1969 - Cassandra of the future waves a gate activation device to return SG-1 to their proper time.
Small Victories - Thor uses his Asgard gate activation device to take him and Samantha Carter back to an Asgard world to fend off the Replicators.