external its seen lots of use, was carried on duty for yrs, it had quite a story behind it, the switch works fine, bulb and reflector seems ok, internally it had some leakage yrs back and was cleaned and oiled to prevent more damage, I believe it would work fine with batteries and a good cleaning. This light was involved in a bank robbery, chase,shoot out with the robbers. It belonged to a Dallas PD officer that was shot with it in his possession, I have the name of the officer if needed, all this can be verified, I was given all his duty possessions yrs ago, it went back to Safariland, KelLight, for a tune up after the shooting and was re anodised by them. It just sets on a shelf in my garage, I will never use it anymore, I am not a collector, I just use lights every night here on the ranch, if someone is interested in it let me know, if I remember it says Dallas PD on it and a name, just a well used duty light. 4 d cell