Choose Amber or Red beacon, with strong magnetic base. These are 4" diameter and 4" tall. The lens screws off and has a water tight seal with rubber O-ring, inside is where you put 4-AA batteries (not incl.). This light has been tested to run over 4 hours constant and if you use the light intermittently you will get a lot more hours than that out of one set of good batteries.
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LED Safety Light
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