Hold the light from the top from the rubber glare guard and snap it down. You will hear a “clack” sound as the ball is released. To get your buddy’s attention, just shake it! When you don’t need to use the noisemaker,tilt the light downwards to reset the ball against the magnet. Tip - Don't annoy your fellow divers, and avoid using it to point out a common parrotfish…discretion is advised.