This light can be used separately or paired with our Helios and Optimus engagement indicators. After pairing the light with the detectors, it allows you to freely adjust the color of the diode so that you know exactly which rod you are currently engaged in. At the time of shooting, the light will turn on in the same color as your LED on the detector, while the other surrounding LEDs will turn white, giving you a bright light at night. The light can be freely set to stay on for 10, 20, 40 or 80 seconds after activation. You can attach it to the bivouac using the magnetic pad included in the package. The light requires 3x AAA batteries (not included).