A common sight on weapons used by the American Union, Stellar Arms Tactical Device #4 incorporates an infrared laser, infrared optic, and powerful conventional flashlight. This gives the common soldier the ability to see in the dark or around corners through their gun-mounted camera along with some other basic capabilities.

The SA-TD4 is a basic tactical device that is intended to be attached to a weapon. It can be connected to an external power pack or computer system through either wired or wireless connections. The thermal camera can be connected to a soldier's display to allow them to look around corners while the infrared laser can be used for a variety of uses. Since the laser is only visible on the infrared wavelength, soldiers can use it as a laser sight with a reasonable assumption that it won't be seen by enemies.

The light on the device can be set for regular or strobing mode, and is designed to provide regular illumination for soldiers or to disorient opponents at close range.