The Gravity Mine is an equipment exclusive to the Strogg in Enemy Territory: Quake Wars.
General Information
The Gravity Mines work exactly like the GDF ones. Strogg Constructor can install up to three mines. Deploying more will make the oldest ones disappear. Mines work in two ways. To use the first one, click fire button to plant a charge and then arm it. The mine will just react when an enemy gets nearby. The second one (triggered with alt. fire button) turns on a laser - if someone gets through it, the bomb goes off. Laser mines can be installed only on walls. A later upgrade allows Gravity Mines to self arm themselves.