Hi folks- Long time lurker, first time poster. LEO/EMT/SAR enthusiastic about preparedness.

A query, if this is the appropriate venue:

I have opportunity to purchase a large quantity of strobe beacons. They are DOD surplus, marked "Light Marker, distress", NSN 6230000675209. I know little about these. Does anyone have any advice on what to check when inspecting these? Input on their degree of utility? Serviceability? Durability? A source for spares?

Thanks for your replies.