Cyalume Technologies Infrared (IR) lightstick are invisible to the naked eye

The lightstick can be seen through a variety of image intensified night vision devices

The 6 Inch; Infrared Cyalume Lightstick is a portable and cost-efficient source of light. Each lightstick is a pliable, plastic tube filled with two non-toxic chemical solutions, one held separate in a floating ampule to prevent activation until required.

They are packaged in a foil wrapper for protection until use.

To activate, bend the tube and shake. This breaks the ampule and mixes the chemicals.