Tok'ra forcefield generator
From The Stargate Omnipedia
Small unit, approximately the size of a human fist, which can activate or deactivate a Tok'ra forcefield. Red indicates the shield is offline. A green light indicates that it is online and ready for operation.
The interface control mechanism is connected to a set of blue-colored panels, which generate the energy barrier.
KEY EPISODE
Prototype - The S.G.C. uses a Tok'ra forcefield, and its generator, in the hopes of confining Khalek to the isolation ward.