Size: 133 x 51mm Weight: 100g Visibility: 4km Battery Alkaline"D"cell: One Battery Life: 20days Flash Rate: 1.5sec Waterproof: 100m Features Fishing Net Indicating Lights Photo sensitive strobe marker light -Multi-purpose buoy marker light(geo-seismic research, fishing, etc):also used to designage dengerous aresa, construction and work areas, roadside emergencies or can be used as a general distress marker -Lightweight, easy to install, simple to operate -Photocell activated:"ON" at dusk,"OFF" at down *Material:Strong, impact resistant ABS resin *Color:International Orange, Yellow, Red *Beam Angle:Omni-directional 360° *Visibility:High intensity strobe is visible up to 3.7miles(6km) *Lamp:Xenon flash tube All Items have LED Lamp & Xenon Tube for Flash and It Flashes Successively