1. Hold the mirror with one hand and then aim the mirror to the light to let the light beam reflect to the other palm.2. Keep the relative position and move the central target hole of the signal mirror to the eye, then you can watch clearly a bright spot. This spot is the sight bead.3. Move the signal mirror slowly to make the spot overlap the goal that needs to be communicated. Therefore, the goal will see your heliogram accurately.4. If you can't see clear communicational goal, you can move the sight bead back and forth along the horizon. In this way, the heliogram can be seen dozens of kilometers even if in a foggy day.Color: transparentDimension: about 7.8 x 5 x 0.8 cmFunction description: signal mirror, compass, whistleMaterial: PlasticPackage contents1 x Signal mirrorNote:Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.