ACR SM3 Marker LightIntroducing the ACR SM3 Lifebuoy Marker Lighta compact MOB beacon designed for commercial maritime operations. It delivers 360 visibility up to about 2 miles and activates automatically when it hits the water, ensuring signaling is immediate when every second counts. Model: SM 3 Activation: Automatic gravity switch; automatically activates and begins flashing when placed in water or upright Light & Visibility: Ultra Bright LED with 360 visibility;