For emergencies, keep a puck around. The floating, rechargeable 9-in-1 Safety Puck can create nine combinations of lights and flashing patterns, including pulsing, swirling lights and a flashlight-style beam. Sixteen super-bright LEDs around the outer rim emit 360 degrees of light. It’s visible from up to half a mile and works in temperatures from minus 20 to 130. It’s magnetic and waterproof. The rechargeable battery will run up to 100 hours.