solar LED flashing light can be installed on ships,boats,barges,watercraft,dredger,work boat,vessel,river boat,towage,warship SPECIFICATION 1).Nominal night visibility:2km-5.5km 2)Turn on at dust and turn off at dawn automatically. 3)Completely self containt,no cables,no people management. 4)Waterproof and shock resistant 5)Nearly recharge themselves at nearly all kinds of conditions. 6)Automony ...