Instapark IHB888 LED Flashing Floating Crab / Lobster Buoy with Built-in Photosensor, 2-Pack Battery-powered flashing LED crab / lobster buoy with built-in photosensor that turns on the light when it's dark and switch off when it's bright, requires 1 D size battery (not included) Highly visible from up to 1 mile away, deal for locating crab pot or lobster cage in the dark 5 super-bright long-life LED bulbs blinking at a rate of 120 times per minute Made of corrosion resistance material, suitable for both fresh water and salt water One-year manufacturer's warranty with CE & RoHS Certifications